Produced by Chris Curnow, Joseph Cooper, Josephine Paolucci
and the Online Distributed Proofreading Team at
https://www.pgdp.net.







UNIVERSITY OF KANSAS PUBLICATIONS
MUSEUM OF NATURAL HISTORY

Vol. 19, No. 5, pp. 361-393, 8 figs.
January 18, 1971




Mammals of Northwestern South Dakota


KENNETH W. ANDERSEN and J. KNOX JONES, JR.

UNIVERSITY OF KANSAS
LAWRENCE
1971


UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors of this number:
Frank B. Cross, Philip S. Humphrey, William E. Duellman


Volume 19, No. 5, pp. 361-393, 8 figs.
Published January 18, 1971


UNIVERSITY OF KANSAS
Lawrence, Kansas


PRINTED BY
THE UNIVERSITY OF KANSAS PRINTING SERVICE
LAWRENCE, KANSAS
1971

[Transcriber's Note: Words surrounded by tildes, like ~this~ signifies
words in bold. Words surrounded by underscores, like _this_, signifies
words in italics.]




Mammals of Northwestern South Dakota

BY

KENNETH W. ANDERSEN and J. KNOX JONES, JR.


The mammalian fauna of the western Dakotas and adjacent Montana is
relatively poorly known. Few published reports have dealt with mammals
from this part of the Northern Great Plains, and none of these involved
detailed study of a restricted area. The present report summarizes
information gathered in Harding County, northwestern South Dakota, and
includes material on the more than 50 species of mammals that are known
to occur there.

Harding County has an area of approximately 2700 square miles (Fig. 1).
The county first was organized in 1881, but the present boundaries were
not fixed until 1908. Physiographically, it lies in that part of the
Missouri Plateau frequently termed the "Cretaceous Table Lands." The
general topography is one of rolling hills and flats--mostly range land
vegetated by short grasses and sage--broken by spectacular buttes and
hills that rise 400 to 600 or more feet above the surrounding plains.
These monadnocks are "... part of a system of Tertiary erosional
remnants standing above the Late Cretaceous rocks of northwestern South
Dakota...," according to Lillegraven (1970:832), who went on to point
out: "The butte tops are flat and grass-covered. The western sides are
being actively cut away by slumping, and the topography below the
western cliff walls is hummocky with sparse vegetation. The eastern
flanks of the tables are, by contrast, less cliff-forming and less
slumped and are generally well forested with coniferous and deciduous
trees." Slim Buttes, the North and South Cave Hills, the East and West
Short Pine Hills, and the Long Pine Hills, which barely enter the county
north of Camp Crook, comprise the pine-clad buttes; other prominences,
such as Table Mountain and Sheep Buttes, are all but nude of coniferous
cover. The highest point in the county, "Harding Peak," is 4019 feet
above sea level.

Sediments underlying northwestern South Dakota include rocks assignable
to the Pierre (shale), Fox Hills (sand), and Hell Creek formations of
Cretaceous age and the Ludlow and Tongue River formations of the
Paleocene. These rocks may be exposed at the surface, but usually are
overlain by relatively thin soils that are mostly derived from them; the
best soil in the county for agricultural purposes is the loessal sandy
or silty loam in the northeastern quarter, which is derived from Tongue
River sediments (Baker, 1952).

[Illustration: FIG. 1. Map of Harding County, South Dakota, showing
location of places named in text.]

The climate of northwestern South Dakota is characteristic of the
northern part of the interior grasslands of North America--that is, the
winters are cold and the summers hot and dry. Weather data for the
period 1896-1967 at Camp Crook are representative of those gathered at
the several stations maintained in the county. At Camp Crook the mean
temperature for January is 17.3 F, whereas that for July is 71.2 F;
precipitation averages 13.17 inches annually, most falling in the months
of April through September; snowfall amounts to an average of 33.2
inches per year and is recorded from every month from September through
May (Climatogeography of the United States, no. 20-39, Camp Crook, South
Dakota, 1969).

Major surface drainage systems in Harding County include the Little
Missouri River, which flows northward through most of the western part
of the county, the South Fork of the Grand River, which originates in
the east-central part of the county and flows generally eastward, and by
the North Fork of the Moreau River, which originates in the south and
drains in a southeasterly direction. Permanent standing surface water
was virtually unknown prior to the development of artificial
impoundments.

[Illustration: FIG. 2. Central part of Slim Buttes as viewed from the
east.]

Vegetation of the grassland areas in the county is typical of that found
throughout the semi-arid Northern Great Plains. Cover on upland soils,
especially those that are clayey in substance, generally is sparse;
areas along water courses and well-watered sites elsewhere tend to have
denser stands of grasses such as bluestem (_Andropogon_). Dominant
grasses of upland are gramma, buffalo grass, wheat grass, stipa, and
tickle grass. Sage (_Artemisia_) and numerous forbs are prominent in
many areas. These grasslands are used extensively for grazing of sheep
and cattle.

[Illustration: FIG. 3. Fuller Canyon, North Cave Hills.]

[Illustration: FIG. 4. Little Missouri River southwest of Ladner. Note
beaver dam in background and nature of riparian community.]

[Illustration: FIG. 5. Stand of pines on northern part of Slim Buttes.]

[Illustration: FIG. 6. Draw with deciduous trees in North Cave Hills.]

[Illustration: FIG. 7. Spring-fed artificial impoundment in Deer Draw,
Slim Buttes.]

[Illustration: FIG. 8. Farm land in northeastern part of Harding
County.]

The wooded buttes mentioned above are at least in part within the
boundaries of Custer National Forest and support western yellow pine
(_Pinus ponderosa_) and junipers (_Juniperus_ sp.). In some ravines and
other protected sites there are groves of deciduous trees such as
cottonwood, aspen, boxelder, ash, hackberry, elm, dogwood, and hawthorn,
usually associated with shrubs such as buckbrush, chokeberry, plum,
currant, and gooseberry. These groves frequently are associated with
small springs, as the one in Deer Draw of the Slim Buttes. The major
water courses and their tributaries are essentially treeless, although
occasional stands of cottonwoods and other deciduous trees and shrubs
occur in some places--for example along the Little Missouri near Camp
Crook. Some representative habitats in Harding County are illustrated in
Figs. 2-8.

Our interest in Harding County dates from August of 1960, when one of us
(Jones) and Robert R. Patterson visited the area briefly and obtained a
small collection of mammals. Subsequently, field parties from the Museum
of Natural History collected mammals in the county in the periods 14-30
June 1961, 23 March-11 April 1963, 5-7 July 1965, and 13 May-11 June
1968. Incidental collection also occurred in the extreme western part of
the county in the period 29 June-24 July 1970 when a group was working
primarily in the Long Pine Hills of adjacent Carter County, Montana.

There are few published references to mammals in Harding County. Visher
(1914), in an early biological survey of the area, listed 40 species of
mammals, but his accounts are mainly of historic value. Subsequently,
publications by Bailey (1915), Young (1944), Goldman (1944), Over and
Churchill (1945), Jones and Genoways (1967), and Henderson _et al._
(1969) have recorded mammals from the county.


ACCOUNTS OF SPECIES

Fifty-three species of mammals known from Harding County, South Dakota,
are treated in the accounts that follow. Appended is a brief discussion
of 10 additional species that may be found there. In most accounts,
specimens that have been examined (a total of 644) are listed in
telegraphic style preceding remarks; localities are arranged from north
to south in such lists. Unless otherwise noted, specimens are housed in
the Museum of Natural History. All measurements are in millimeters
(those of embryos are crown-rump lengths) and weights are given in
grams.


Order Chiroptera


~Myotis evotis evotis~ (H. Allen, 1864)

Long-eared Myotis

_Specimens examined_ (20).--NW 1/4 sec. 15, R. 5 E, T. 22 N, 2; 5 mi. N,
2 mi. W Camp Crook, 1; 10 mi. S, 5 mi. W Reva, 16; 7 mi. S, 4-1/2 mi. E
Harding, 1.

The long-eared myotis is not uncommon in and around wooded buttes. The
species may be mostly limited to these areas; an individual of unknown
sex found dead in a small stream southeast of Harding (several miles
south of the East Short Pine Hills) is the only specimen not taken in
such a situation. North of Camp Crook, on the eastern edge of the Long
Pine Hills, several _M. evotis_ used an abandoned shed as a night roost
in the summer of 1970; one was captured in a bat trap set at one of the
entrances to the shed.

Females obtained on May 29 and June 17 and 19 carried single embryos
that measured 3, 14, and 15, respectively. A male young of the year
taken on August 6 was nearly of adult size. Testes of two May-taken
males measured 4 and 2, whereas those of one taken on July 17 and
another captured on August 3 measured 6.0 and 7.5, respectively.

Of seven adults collected in the period August 3 to 6, three females and
two of four males were in fresh pelage; molt was nearly completed on the
two remaining males. A male taken in mid-July was in an early stage of
molt. New pelage is pale yellowish brown in contrast to the golden brown
pelage of specimens taken in May and June.

Chiggers, _Leptotrombidium myotis_ (Ewing), were found on the ears of
one long-eared myotis.


~Myotis leibii ciliolabrum~ (Merriam, 1886)

Small-footed Myotis

Eight males of this saxicolous species were shot or netted as they
foraged over a small man-made pond in wooded Deer Draw in the Slim
Buttes, 10 mi. S and 5 mi. W Reva--six in late June and two in early
August. Probably this bat will be found in rocky areas elsewhere in the
county. One specimen taken on June 23 was molting over much of the body.


~Myotis lucifugus carissima~ Thomas, 1904

Little Brown Myotis

_Specimens examined_ (27).--2 mi. N, 5 mi. W Ludlow, 1; NW 1/4 sec. 15,
R. 5 E, T. 22 N, 4; NE 1/4 sec. 24, R. 8 E, T. 21 N, 20; 4 mi. S, 7 mi.
W Ladner, 1; 10 mi. S, 5 mi. W Reva, 1.

This bat is widely distributed in northwestern South Dakota and was the
only species of _Myotis_ reported by Visher (1914:91) in his early
natural history survey of Harding County. We took specimens from several
of the wooded buttes and also in areas well-removed from timber; one was
shot, for example, as it foraged over the Little Missouri River in the
extreme western part of the county. On May 28, 1968, a barn was located
in which an incipient maternal colony (several hundred adult females)
roosted between double rafters supporting a metal roof. The owner of the
barn, Robert Parks of Ralph, stated that bats have utilized this place
as a summer roost for several years. The barn stands adjacent to the
nearly treeless Big Nasty Creek, which flows through the hilly terrain
of the northeastern section of the county.

Fourteen of 20 females taken from the colony each carried a single
embryo (crown-rump lengths measured 2 to 11 with a mean of 5.4). The
other six were not visibly pregnant upon gross examination but had
enlarged uteri, possibly indicating recent implantation. Of the
remaining females from Harding County, three collected on May 29 had
enlarged uteri, whereas two collected in late June evidenced no gross
reproductive activity. A male obtained May 29 had testes that measured
4.

Ectoparasites obtained from this species include chiggers,
_Leptotrombidium myotis_ (Ewing), a tick, _Ornithodoros kelleyi_ Cooley
and Kohls, fleas, _Myodopsylla gentilis_ Jordan and Rothschild and _M.
insignis_ (Rothschild), and an unidentified species of mite.


~Myotis volans interior~ Miller, 1914

Long-legged Myotis

_Specimens examined_ (43).--2 mi. N, 5 mi. W Ludlow, 4; NW 1/4 sec. 15,
R. 5 E, T. 22 N, 12; 10 mi. S, 5 mi. W Reva, 27.

The long-legged myotis is one of the commonest bats of the wooded
buttes, accounting for almost half of all chiropterans taken in these
areas. Most of our specimens were shot as they foraged among trees and
over water in the evening; a few were captured in mist nets.

Uteri of eight females obtained in the period May 23 to 31 were
enlarged; two females collected on June 29 carried single embryos that
measured 20 and 22. A lactating female was taken on August 3, but three
other adult females taken early in the same month evidenced no
reproductive activity. Testes measured 2 to 4 in three May-taken males
and 4 in each of two from June.

Two males obtained June 16 and 23 were molting as evidenced by new hairs
under the old pelage over much of the body.

_Myotis volans_ that we examined for ectoparasites harbored chiggers,
_Leptotrombidium myotis_ (Ewing), and fleas, _Myodopsylla gentilis_
Jordan and Rothschild.


~Lasionycteris noctivagans~ (LeConte, 1831)

Silver-haired Bat

A single female, which contained two embryos that measured 4, represents
the only record of a silver-haired bat from Harding County. This
specimen was shot at dusk on June 1, 1968, as it foraged over a small
pond in Deer Draw of the Slim Buttes (10 mi. S and 5 mi. W Reva).
Several other bats believed to be of this species were seen at the same
place that evening. We initially assumed that these were late migrants,
but recent findings indicate that this species is a common summer
inhabitant of the Long Pine Hills in adjacent Carter County, Montana,
and likely, therefore, also a resident in favored sites in Harding
County.


~Eptesicus fuscus pallidus~ Young, 1908

Big Brown Bat

_Specimens examined_ (11).--NW 1/4 sec. 15, R. 5 E, T. 22 N, 3; 7 mi. N,
2 mi. W Camp Crook, 3300 ft., 2; 10 mi. S, 5 mi. W Reva, 6.

The big brown bat is a common inhabitant of the Slim Buttes and North
Cave Hills, where individuals were shot or netted as they foraged over
water or among trees late in the evening.

Two May-taken females had enlarged uteri and one taken on July 8 was
lactating. The testes of a May-taken male measured 5, whereas those of
one obtained in early July measured 9. One of two males shot on August 4
was a young of the year; the other, an adult, was in fresh pelage as was
an adult male shot on July 8. The July-taken lactating female and three
June-taken specimens were in old pelage. Several specimens were
parasitized on the ears by chiggers, _Leptotrombidium myotis_ (Ewing).


~Lasiurus cinereus cinereus~ (Palisot de Beauvois, 1796)

Hoary Bat

The hoary bat seemingly is an uncommon summer resident of Harding County
as but one specimen, a non-pregnant female, has been taken there. This
bat was shot on the evening of June 22, 1961, in the Slim Buttes as it
foraged over a small pond in Deer Draw (10 mi. S and 5 mi. W Reva).


~Plecotus townsendii pallescens~ (Miller, 1897)

Townsend's Big-eared Bat

_Specimens examined_ (4).--2 mi. S, 3-1/4 mi. W Ludlow (Ludlow Cave), 2
(1 SDSU); 10 mi. S, 5 mi. W Reva, 2.

This big-eared bat evidently is uncommon in northwestern South Dakota.
Of the four specimens examined, two were taken at Ludlow Cave and two
were taken in June in the southern part of Slim Buttes--a female shot as
it foraged over a pond in Deer Draw and another female netted over a
water tank at Summit Spring about a half mile south of Deer Draw.

Ludlow Cave, in the caprock on the southeastern edge of the North Cave
Hills, was formed by water erosion, resulting in numerous pockets and
crevises in the ceiling and walls. The cave faces northwest; the mouth
measures approximately 10 feet in diameter. A few feet from the entrance
the cave narrows and approximately 50 feet back it is no more than three
feet in diameter, although in the first 30 feet or so the ceiling varies
from 10 to 15 feet in height. A thorough search of this cave on June 18,
1961, revealed one bat, a male _Plecotus_, which was shot from the
ceiling about 15 feet from the entrance. No bats were found when the
cave was visited on May 16 and again on June 4, 1968. Visher (1914:92)
reported that several _Plecotus_ were found there in early September,
1912. Probably Ludlow Cave, along with the several abandoned coal mines
in the county, serves as a hibernaculum for some species of bats.


Order Lagomorpha


~Lepus townsendii campanius~ Hollister, 1915

White-tailed Jack Rabbit

_Specimens examined_ (15).--NW 1/4 sec. 23, R. 1 E, T. 23 N, 1; sec. 24,
R. 1 E, T. 22 N, 1; 2 mi. N, 2 mi. E Ladner, 1; 4 mi. S, 7 mi. W Ladner,
2; 10 mi. S Ladner, 1; 6 mi. N, 2-1/2 mi. W Camp Crook, 1; 2 mi. N
Buffalo, 1; sec. 30, R. 3 E, T. 19 N, 1; SW 1/4 sec. 26, R. 2 E, T. 19
N, 1; 10 mi. S, 5 mi. W Reva, 3; 12 mi. S, 5 mi. W Reva, 1; 17 mi. S, 4
mi. W Reva, 1.

This jack rabbit is abundant throughout the areas of short grass in the
county and individuals occasionally utilize grassy slopes of buttes.
Extensive favorable habitat and the paucity of natural predators
resulting from control operations probably are the principal factors
favoring the heavy concentrations of this hare noted by all of our field
parties.

A female examined on May 21 carried five fetuses and each of two others
examined late in May carried six; all fetuses were nearly of the same
size (110 to 120) and were completely covered with hair. A female
obtained on May 31 appeared to have recently weaned young and females
examined on June 5 and 17 were lactating. A female shot on June 28 and
another taken on July 12 proved to be approximately half grown,
although young of the year collected on June 16, 26, and 28 were nearly
of adult size.

In late March of 1963, white-tailed jack rabbits were molting to summer
pelage from the white pelage of winter.


~Sylvilagus audubonii baileyi~ (Merriam, 1897)

Desert Cottontail

_Specimens examined_ (12).--2 mi. N, 5 mi. W Ludlow, 2; 10 mi. S, 4 mi.
W Ladner, 1; 7 mi. N, 2-1/2 mi. W Camp Crook, 3300 ft., 1; 5 mi. W
Buffalo, 1; 10 mi. S, 5 mi. W Reva, 7.

The desert cottontail is a common inhabitant of the uplands of Harding
County, especially where varied local relief and in some instances
brushy vegetation provide suitable cover. A female shot on May 26 in a
dense stand of pines in the North Cave Hills carried five embryos that
measured 75, another taken on July 4 was pregnant with six embryos that
measured 18, and two females collected on June 16 and another on June 24
carried seven embryos that measured 32, 40, and 45, respectively. Two
subadults collected in late June and two collected in early August were
nearly full grown. The testes of an adult male obtained on March 28
measured 50.

The male mentioned above was completely in winter pelage. Adults taken
on June 16, 23, and 24 had almost completed molt to summer pelage, but
each retained some evidence of active hair replacement, most often over
the shoulders; a pregnant female obtained on July 4 had only partially
completed the molt to summer pelage. An adult female in summer pelage
that was taken on August 4 was inexplicably molting on the sides and
over the shoulders.

A May-taken female was parasitized by fleas, _Cediopsylla inaequalis_
(Baker).


~Sylvilagus floridanus similis~ Nelson, 1907

Eastern Cottontail

_Specimens examined_ (2).--4 mi. S, 7 mi. W Ladner, 1; 10 mi. S, 5 mi. W
Reva, 1.

This rabbit is uncommon in northwestern South Dakota and evidently is
strictly associated with riparian habitats. Our only specimens were
taken along the Little Missouri River, where thickets and small
cottonwood trees were prevalent, and at the edge of a thicket in
spring-fed Deer Draw of the Slim Buttes.

A female obtained on June 26 carried eight embryos that measured 26, and
was in process of seasonal molt. Testes of a male shot on May 20
measured 35.


Order Rodentia


~Eutamias minimus pallidus~ (J. A. Allen, 1874)

Least Chipmunk

_Specimens examined_ (31).--2 mi. N, 5 mi. W Ludlow, 15; NW 1/4 sec. 15,
R. 5 E, T. 22 N, 2; 2 mi. S, 3-1/4 mi. W Ludlow, 2; NW 1/4 sec. 32, R. 1
E, T. 20 N, 1; 9 mi. S, 7 mi. W Reva, 1; 10 mi. S, 5 mi. W Reva, 9; NE
1/4 sec. 8, R. 8 E, T. 16 N, 1.

The least chipmunk is common in the buttes and associated badlands
where it most frequently inhabits rocky areas. Visher (1914:88) reported
_E. minimus_ from Harding County ("abundant in badlands"), but his paper
has been overlooked by most subsequent workers. Visher's mention of a
chipmunk from the mouth of the Moreau River in north-central South
Dakota, incidentally, would seem to be in error, as would the report by
Over and Churchill (1945:28) of _Eutamias_ inhabiting "... thickets
along the Little Missouri River of Harding County."

Females evidently bear but one litter annually (in late May) in
northwestern South Dakota and young are weaned by the latter part of
June. Females taken on May 15 and 19 carried embryos (five measuring 30
and three measuring 28, respectively). A lactating female with five
placental scars was obtained on May 24, but eight adult females taken
after June 23 previously had weaned young. Juveniles were collected on
June 24 and 25. Testes of two adult males collected in mid-May measured
11 and 18, but males taken in summer had much smaller testes.

In late spring, most adult least chipmunks molt from the worn, drab-gray
pelage of winter to a brighter, more tawny summer pelage, but molt in a
few females, perhaps originally delayed by reproductive activity,
continues well into the summer months. Of seven specimens taken between
May 15 and 24, two (one male and one lactating female) were in an early
stage of molt, whereas the remainder were in winter pelage. Nine
specimens (four females and five males) taken in mid- and late June were
molting, but two females collected then were in winter pelage, and three
animals, two males and a female, had completed molt to summer pelage.
One adult female taken on August 5 had yet to complete molt to summer
pelage. In our material, the first indication of molt from winter to
summer pelage appears on the top of the head and the cheeks. Thereafter,
molt proceeds posteriorly over the shoulder region and more or less
evenly along the back and sides. In two specimens, small patches of molt
preceded the general molt line. Molt on the venter apparently begins
after molt on the dorsum approaches completion, but we could discern no
definite pattern; on four specimens, hair was being replaced on the
venter in scattered patches.

An August-taken young of the year engaged in post-juvenal molt had new
adult pelage in a vague hour-glass pattern in the dorsal trunk region as
well as on the cheeks and anterior part of the head. It was actively
molting on top of the head, between the ears, over the shoulders,
laterally behind the front feet, and along the sides, and had old pelage
on the rump. Ventrally, the new adult pelage was evident only along the
midline.

One adult male examined for ectoparasites harbored a tick, _Dermacentor
andersoni_ Stiles, and fleas, _Monopsyllus eumolpi_ Rothschild.


~Spermophilus tridecemlineatus pallidus~ J. A. Allen, 1874

Thirteen-lined Ground Squirrel

_Specimens examined_ (22).--2 mi. N, 5 mi. W Ludlow, 5; 19 mi. N, 1 mi.
E Camp Crook, 2; 2 mi. S, 2 mi. W Ladner, 1; 6-1/2 mi. N, 2 mi. W Camp
Crook, 1; 1/2 mi. W Reva, 3; 4 mi. S, 1/2 mi. W Reva, 1; 6 mi. W Reva,
7; 15 mi. S, 4 mi. W Reva, 1; 7 mi. S, 4-1/2 mi. E Harding, 1.

Ground squirrels are common in areas of short grass; we observed them
most frequently along roadways and fencerows in otherwise overgrazed
flats. Many of our specimens were shot or taken in break-back traps
baited with rolled oats in just such situations.

Young from the first litters of the year were above ground by late June
and represented the largest segment of the population at that time; for
example, only three of 17 individuals collected from June 20 to 27 were
adults. Adult females collected on June 20 and July 7 had enlarged
mammae but were no longer lactating.

Time of emergence from hibernation in northwestern South Dakota is
unknown, but many ground squirrels were active in the last week of
March, 1963. A male obtained on March 28 had testes that measured 27 and
was in full winter pelage, which is easily distinguished from the
shorter, darker pelage of summer.


~Cynomys ludovicianus ludovicianus~ (Ord, 1815)

Black-tailed Prairie Dog

_Specimens examined_ (5).--Sec. 25, R. 3 E, T. 22 N, 2; 1-1/2 mi. W
Buffalo, 1; 1/2 mi. W Camp Crook, 3200 ft., 2.

The extensive flatlands of short grasses on relatively deep soils
provide ideal habitat for the black-tailed prairie dog in Harding
County. Visher (1914:89) mentioned extensive colonies along "flats" of
streams and reported one "town" west of the Little Missouri River that
covered several sections and another "on the table of the West Short
Pine Hills." Recently, emphasis on control of numbers of prairie dogs in
the area has reduced many formerly extensive colonies to small, disjunct
units. According to Robert Kriege (personal communication, 1968), a
"town" of approximately 3000 acres, about five miles east of the Little
Missouri River (in R. 2 E, T. 21 N), is the largest remaining in the
county. Thirteen other colonies then known to him ranged in approximate
size from 25 to 300 acres.

White-colored prairie dogs apparently are not uncommon in some areas of
the county and local residents reported to us a number of instances of
sighting such individuals. One "town" located 7-1/2 mi. N and 12 mi. W
Ladner, in the northwestern corner of the county, contained at least six
families of white individuals, congregated together at the edge of the
colony, in the spring of 1968. White prairie dogs also were noted by one
of our field parties in 1963 in a "town" formerly located 7-1/2 mi. W
Buffalo.


~Tamiasciurus hudsonicus dakotensis~ (J. A. Allen, 1894)

Red Squirrel

Visher (1914:88) reported that he obtained a red squirrel in the Long
Pine Hills, along the western border of Harding County, in July of 1910
and noted that the species had been reported to him as occurring also in
the West Short Pine Hills. Visher's record evidently has been overlooked
by subsequent cataloguers (see, for example, Hall and Kelson, 1959: map
257). Insofar as we can ascertain, _T. hudsonicus_ does not now occur on
any of the pine-clad buttes and ridges of the county, although the
species is present in relatively dense stands of ponderosa pine in the
Long Pine Hills of adjacent Carter County, Montana, at a place only a
few miles west of the South Dakota border. Probably some individuals
stray into the relatively small and sparsely-wooded areas of the Long
Pine Hills that extend eastward to the north of Camp Crook.

On the basis of color, specimens we have examined from the Long Pines
clearly are assignable to _T. h. dakotensis_ rather than to _T. h.
baileyi_, substantiating in part the statement of the distribution of
_dakotensis_ published by Miller and Kellogg (1955:263).


~Thomomys talpoides bullatus~ Bailey, 1914

Northern Pocket Gopher

_Specimens examined_ (22).--NE 1/4 sec. 22, R. 1 E, T. 23 N, 1; 7 mi. N,
2-1/2 mi. W Camp Crook, 3300 ft., 3; Camp Crook, 1; 10 mi. S, 5 mi. W
Reva, 10; 10 mi. S, 4 mi. W Reva, 4; 2 mi. S, 5 mi. E Harding, 2; Crow
Buttes, 1 (USNM).

The northern pocket gopher probably occurs in most areas of northwestern
South Dakota where the soil is sufficiently deep for constructing
burrows, but we found it commonest in the lower grassy slopes of buttes
and in relatively sandy areas along some of the major streams.

A female obtained on June 20 contained two embryos that measured 3.
Testes of an adult male trapped on May 18 measured 19 and those of one
taken on July 6 measured 9. Juveniles were collected in both May and
June.

Bailey (1915:102) referred a specimen from Crow Buttes to _T. t.
bullatus_, but Swenk (1941:3), in the original description of _T. t.
pierreicolus_, suggested that this same specimen "probably" was
referable to the latter because he assumed it came from soils of the
Pierre series. However, Baker (1952:8) included the Crow Buttes in the
Hell Creek formation and, in any event, one of us (Jones) examined the
specimen in question and found it clearly referable to the subspecies
_bullatus_. Over and Churchill (1945:32) erroneously assigned pocket
gophers from northwestern South Dakota to two different subspecies
(_bullatus_ and _clusius_), referring at least one individual from
Harding County to _T. t. clusius_.

Fleas, _Dactylopsylla ignota_ (Baker), were found on one individual
examined. Molting adults were taken in each month from May through
August.


~Perognathus fasciatus fasciatus~ Wied-Neuwied, 1839

Olive-backed Pocket Mouse

_Specimens examined_ (16).--2 mi. N, 5 mi. W Ludlow, 3; 4 mi. S, 7 mi. W
Ladner, 9; 10 mi. S, 5 mi. W Reva, 1; 14 mi. S, 4 mi. W Reva, 2; 15 mi.
S, 4 mi. W Reva, 1.

This pocket mouse is not uncommon in areas of short grass and sage in
Harding County. None of five adult females taken late in June was
pregnant or lactating, but three had enlarged mammae indicative of
reproductive activity earlier in the spring, to which young of various
sizes in our series also attest. Active molt was evident on adults taken
on June 19, 26, and 28.

Our specimens are intergrades between _Perognathus fasciatus fasciatus_
and the paler _P. f. olivaceogriseus_. Average external measurements of
seven adults (two males and five females) are: total length, 138.0
(130-150); length of tail, 65.3 (59-74); length of hind foot, 17.1
(15-18.5); length of ear (six specimens only), 6.8 (6-7); weight in
grams (five specimens only), 12.9 (11.2-14.6). Selected cranial
measurements of the two males and two of the females are, respectively,
as follows: occipitonasal length, 24.0, 23.2, 23.5, 22.3; interorbital
breadth, 4.9, 5.2, 5.0, 5.0; mastoid breadth, 13.0, 13.1, 12.2, 11.9;
length of maxillary toothrow, 3.3, 3.3, 3.1, 3.4.


~Perognathus hispidus paradoxus~ Merriam, 1889

Hispid Pocket Mouse

An adult female, not reproductively active, that was trapped in rather
sparsely vegetated rangeland to the southwest of Slim Buttes (14 mi. S
and 4 mi. W Reva) on July 19, 1961, is the only specimen of the hispid
pocket mouse on record from Harding County. Other species of small
mammals taken in the same or adjacent traplines were _Perognathus
fasciatus_, _Dipodomys ordii_, _Reithrodontomys megalotis_, _Peromyscus
maniculatus_, and _Onychomys leucogaster_.

A single individual reported from Wade, Grant Co., North Dakota, by
Bailey (1927:123), approximately 100 miles to the northeast, is the only
specimen known from a more northerly locality.


~Dipodomys ordii terrosus~ Hoffmester, 1942

Ord's Kangaroo Rat

_Specimens examined_ (13).--NE 1/4 sec. 22, R. 1 E, T. 23 N, 6; 2 mi. N,
5 mi. W Ludlow, 1; 2 mi. S, 11 mi. W Reva, 1; 14 mi. S, 4 mi. W Reva, 4;
15 mi. S, 4 mi. W Reva, 1.

Ord's kangaroo rat is found in sparsely vegetated flatlands throughout
Harding County, although it appears to be uncommon except in localized
areas of relatively sandy soils. Five of seven specimens taken from June
18 through 24, 1961, were young of the year, as were three of six
individuals trapped on May 31, 1968. One adult female (81.1 grams)
obtained on May 31 was lactating and had four placental scars, whereas
another that weighed 67.2 grams evidenced no recent reproductive
activity. An adult male (67.9 grams) taken on May 31 had testes that
measured 9; those of a subadult male (46.5 grams) taken on the same date
measured only 6.

The two May-taken adult females mentioned above still were completely in
winter pelage, but the adult male trapped at the same time was molting.
An adult male (57.2 grams) obtained on June 22 had completed molt save
for a small patch between the ears and immediately behind the head.


~Castor canadensis missouriensis~ Bailey, 1919

Beaver

_Specimens examined_ (2).--Sec. 22, R. 1 E, T. 20 N, 1; 32 mi. SE
Buffalo, 1.

According to local residents, the beaver is common along many of the
water courses in the county. One of our two specimens came from a
tributary of the Little Missouri River north of Camp Crook and the other
was taken from a tributary of the Moreau River in the southeastern part
of the county. Robert Kriege of Buffalo reported to us that beaver are
not restricted to wooded areas, but frequently inhabit streams and more
or less permanent impoundments bordered by grassland. In such places
they are said to construct bank dens and eat principally sage and forbs.

Visher (1914:89) reported this species along the Little Missouri River,
Boxelder Creek, the forks of Grand River, Bull Creek, and "Devil's
Gulch" in the North Cave Hills, and figured (pl. 6) a dam on Rabbit
Creek. We have observed evidence of beaver activity along the Little
Missouri River southwest of Ladner and along aspen-wooded stream banks
in the Short Pine Hills, where in the spring of 1963 abundant sign was
found.


~Reithrodontomys megalotis dychei~ J. A. Allen, 1895

Western Harvest Mouse

_Specimens examined_ (27).--NE 1/4 sec. 22, R. 1 E, T. 23 N, 1; 4 mi. S,
7 mi. W Ladner, 3; 2 mi. N, 5 mi. W Ludlow, 7; 1/2 mi. W Reva, 14; 10
mi. S, 5 mi. W Reva, 1; 14 mi. S, 4 mi. W Reva, 1.

The western harvest mouse was taken commonly in stands of tall grasses
and forbs, particularly along roadways and fencerows. Occasional
individuals were trapped in areas of mixed shrubs and grasses. Four
pregnant females taken in late June carried the following number of
embryos (crown-rump lengths in parentheses): seven (4), six (5), six
(10), five (4). Three adult males taken in the same period had testes
that measured 7, 7, and 8, whereas those of two May-taken males measured
12 and 6.

Molt from winter to summer pelage was in progress, from anterior to
posterior, on both the dorsum and venter of many May- and June-taken
animals. Some individuals had completed molt, or had but a small patch
of winter pelage remaining on the rump, as early as the last week in
June.


~Reithrodontomys montanus albescens~ Cary, 1903

Plains Harvest Mouse

_Specimens examined_ (3).--2 mi. N, 5 mi. W Ludlow, 2; 1/2 mi. W Reva,
1.

This harvest mouse is uncommon in northwestern South Dakota, although
the species probably occurs sparingly in upland grassy habitats
throughout Harding County. Our specimens, along with one in the
collections of the University of Michigan Museum of Zoology, not
previously reported, from 11 mi. S Mandan, Morton Co., North Dakota,
represent the northernmost known records of this mouse.

A young adult female, obtained on June 21, carried three embryos that
measured 17 and was in summer pelage; an adult male taken on June 27
still was in a worn winter pelage.

At the locality 1/2 mi. W Reva, where traps were set in sparse to
relatively lush grassy areas along South Dakota Highway 20, the
following small mammals were taken in the same trapline (or adjacent
lines) in which one plains harvest mouse was captured: _Spermophilus
tridecemlineatus pallidus_, _Reithrodontomys megalotis dychei_,
_Peromyscus maniculatus nebrascensis_, _Microtus ochrogaster haydenii_,
and _Microtus pennsylvanicus insperatus_.


~Peromyscus leucopus aridulus~ Osgood, 1909

White-footed Mouse

Seven adults of this woodland inhabitant were trapped along
shrub-covered banks of the spring-fed stream and small impoundment in
Deer Draw of the Slim Buttes (10 mi. S and 5 mi. W Reva). Deciduous
trees grew in the bottom of the draw, but the slopes above supported
ponderosa pine and juniper. No white-footed mice were found along the
generally treeless tributaries of the Moreau and Grand rivers to the
east of Slim Buttes nor were these mice found along the Little Missouri
River or in likely-looking habitat in the North Cave Hills. The _P.
leucopus_ of Deer Draw likely represent, therefore, an isolated segment
of a formerly much more broadly distributed population of white-footed
mice on the Northern Great Plains in post-Wisconsin times. Other such
populations may exist in Slim Buttes and perhaps elsewhere in the
county. _Zapus hudsonius_ and _Microtus pennsylvanicus_ were trapped in
Deer Draw in association with white-footed mice.

Females collected on June 15 and August 7 were lactating and one taken
on June 20 contained six embryos that measured 15. Two males taken on
June 2 had testes that measured 12 and 15. These two males and a
lactating female taken on June 15 still were in winter pelage, whereas a
non-breeding female obtained on June 15 and a male and female (pregnant)
trapped on June 20 were in summer pelage or an advanced stage of molt to
that pelage. A lactating female taken on August 7 was in summer pelage
excepting that what definitely appeared to be new winter pelage was
present on the head, cheeks, and below the ears, and molt was evident
adjacent to these areas.

Selected average (and extreme) measurements of the seven adults from
Deer Draw are: total length, 184.4 (175-199); length of tail, 77.4
(70-88); length of hind foot, 21.1 (20-22); length of ear, 16.7 (16-18);
greatest length of skull, 27.8 (27.0-28.4); zygomatic breadth, 14.6
(14.0-14.9); least interorbital width, 4.1 (4.0-4.3); length of
maxillary toothrow, 4.2 (4.0-4.4). Three males and two non-pregnant
females weighed 34.9, 34.6, 30.5, 32.2, and 31.4 grams, respectively.


~Peromyscus maniculatus nebrascensis~ (Coues, 1877)

Deer Mouse

_Specimens examined_ (214).--19 mi. N, 1 mi. E Camp Crook, 5; 18 mi. N
Camp Crook, 2; 2 mi. N, 5 mi. W Ludlow, 58; 4 mi. S, 7 mi. W Ladner, 14;
9 mi. N, 3 mi. W Camp Crook, 3400 ft., 3; 7 mi. N, 2-1/2 mi. W Camp
Crook, 3300 ft., 2; NW 1/4 sec. 32, R. 1 E, T. 20 N, 4; 1/2 mi. W Reva,
2; SW 1/4 sec. 30, R. 7 E, T. 18 N, 5; 9 mi. S, 7 mi. W Reva, 3; 10 mi.
S, 5 mi. W Reva, 64; 14-15 mi. S, 4 mi. W Reva, 33; 2 mi. S, 5 mi. E
Harding, 16; 7 mi. S, 4-1/2 mi. E Harding, 3.

The deer mouse is the most abundant and widespread small mammal in
northwestern South Dakota. We took specimens in all terrestrial
habitats, although the species was commonest in upland situations such
as grassy fencerows, rocky areas, and hillsides supporting shrubs,
juniper, or pine.

Adult mice in reproductive condition were taken in each month from May
through August, although most of our information is for the months of
May and June. In the last half of May, seven pregnant females carried an
average of 5.0 (4-6) embryos that ranged in crown-rump length from 2 to
10; three others taken in the same period had six, six, and three recent
placental scars, and another was lactating. Twenty-three males collected
late in May had testes that measured 5 to 15 (average 10.2). In the last
half of June, 19 females contained an average of 4.9 (2-7) embryos that
ranged in size from 3 to 30 in crown-rump length, and two more were
lactating; seven males obtained in the period June 15-25 had testes that
averaged 8.7 (8-10).

Additionally, we took lactating females on July 6, July 7, and August 7,
and two individuals with recent placental scars on August 5. Twenty
adult males collected in the period July 6 to 18 had testes that
averaged 9.3 (6-11.5), whereas those of two taken on August 4 and 5
measured 10 and 12, respectively. Young animals in juvenal pelage were
captured in each month, May through August, the earliest being taken on
May 20. The first female young of the year that was found carrying
embryos was trapped on June 16.

Molt from winter to summer pelage is evident on some specimens taken as
early as the latter part of May, but most individuals from that period
and from the first part of June still retained winter pelage. By the
last half of June, some mice had completed (or nearly so) the seasonal
molt, but many retained at least some worn pelage of winter into the
first week of July.

Two distinctive maturational pelages are seen in our material--juvenal
and post-juvenal or subadult, which generally resembles adult pelage (of
season) in texture but is duller of color. Collins (1918) for _P.
maniculatus_, Hoffmeister (1951) for _P. truei_, and Brown (1963) for
_P. boylii_, among others, have described maturational pelages and
sequence of maturational molts similar to those observed in our
specimens.

Deer mice from Harding County clearly are referable to _P. m.
nebrascensis_ (rather than to the smaller and paler _P. m. luteus_,
which occurs to the east and southeast), even though adults average
somewhat paler than adults of typical populations of that subspecies. A
tick of the _Ixodes ochotonae-angustus_ complex was obtained from one
specimen.


~Onychomys leucogaster missouriensis~ (Audubon and Bachman, 1851)

Northern Grasshopper Mouse

_Specimens examined_ (4).--NE 1/4 sec. 22, R. 1 E, T. 22 N, 2; 2 mi. N,
5 mi. W Ludlow, 1; 14 mi. S, 4 mi. W Reva, 1.

We found the grasshopper mouse uncommon in Harding County. All four of
the mice listed as examined were trapped in areas supporting sage and
short grasses, with relatively little ground cover.

Three of our four specimens are immature--two males collected on May 31
(testes 10, 12) and a female taken on June 25. An adult male trapped on
June 18 was in winter pelage, but molt was underway on the crown,
between the ears, and over the upper back and shoulders.


~Neotoma cinerea rupicola~ J. A. Allen, 1894

Bushy-tailed Wood Rat

_Specimens examined_ (8).--2 mi. N, 5 mi. W Ludlow, 5; 12 mi. N Buffalo,
1 (USNM); 7 mi. N, 2-1/2 mi. W Camp Crook, 3300 ft., 1; 2 mi. S, 5 mi. E
Harding, 1.

This woodrat is relatively uncommon, yet widely distributed, in
northwestern South Dakota. The species probably occurs throughout the
rocky areas in the hills and buttes of Harding County, and also
frequents abandoned or little-used buildings and feed stations for
livestock. All of our specimens were trapped in rocky habitats, but in
many such places we trapped unsuccessfully for _Neotoma cinerea_, even
though some sign of its presence frequently was evident. Five of our
seven specimens (all taken late in June or early in July) are young of
the year in grayish pelage. An adult male trapped on July 14 had testes
that measured 14.

Over and Churchill (1945:40) mentioned a specimen, which they referred
to the subspecies _N. c. cinerea_, that "probably came from the Slim
Butte area of Harding County." Visher (1914:89) recorded the species as
"plentiful and general" in the county.


~Microtus ochrogaster haydenii~ (Baird, 1858)

Prairie Vole

_Specimens examined_ (40).--NE 1/4 sec. 22, R. 1 E, T. 23 N, 1; NW 1/4
sec. 15, R. 5 E, T. 22 N, 1; 2 mi. N, 5 mi. W Ludlow, 4; 4 mi. S, 7 mi.
W Ladner, 19; 1/2 mi. W Reva, 2; SW 1/4 sec. 30, R. 7 E, T. 18 N, 3; 10
mi. S, 5 mi. W Reva, 10.

The prairie vole is the most abundant of the three microtines that are
known from Harding County. Our specimens came primarily from areas of
relatively dense grasses, such as those found in stream bottoms and
along fencerows. At two places, along a fencerow 1/2 mi. W Reva and in
Deer Draw, 10 mi. S and 5 mi. W Reva, _Microtus ochrogaster_ and the
meadow vole, _M. pennsylvanicus_, were trapped together.

Nine females taken late in May and in June carried an average of 4.4
(3-6) embryos that averaged 14.8 (4-25) in crown-rump length. Each of
two lactating females taken in late May had six placental scars. Testes
of seven adult males taken in May and June averaged 13.1 (12-16) in
length.


~Microtus pennsylvanicus insperatus~ (J. A. Allen, 1894)

Meadow Vole

_Specimens examined_ (14).--1/2 mi. W Reva, 1; 10 mi. S, 5 mi. W Reva,
12; 7 mi. S, 4-1/2 mi. E Harding, 1.

This vole evidently is limited in Harding County to habitats of dense
grass and forbs adjacent to water. We failed to trap the species in some
areas that appeared to be suitable for occupancy.

Two females, collected on May 15 and June 2, contained three and six
embryos, respectively, that measured 15. One female with five placental
scars (May 15) and two with six (May 16, June 2) also were trapped, and
a lactating female was captured on June 20. Testes of two adult males
taken in spring (May 18 and June 2) measured 15, and those of one
weighing 45.6 grams that was taken early in June measured 17.


~Ondatra zibethicus cinnamominus~ (Hollister, 1910)

Muskrat

The muskrat is common in Harding County. Half a century ago Visher
(1914:89) noted that it was "Fairly plentiful along the streams having
deep permanent 'holes'."

Seven adults, all in winter pelage, were taken late in March from a pond
near the west side of Slim Buttes (5 mi. S and 14 mi. E Buffalo). Testes
of three adult males measured 17, 19, and 22; of three females, none
evidenced reproductive activity.


~Mus musculus~ Linnaeus, 1758

House Mouse

The house mouse evidently is uncommon in rural environments in
northwestern South Dakota. One subadult female was trapped along a
"weedy" fencerow, 2 mi. N and 5 mi. W Ludlow.


~Zapus hudsonius campestris~ Preble, 1899

Meadow Jumping Mouse

Eleven specimens of this jumping mouse were taken from a relict
population restricted to a shrub-grass habitat adjacent to a small
spring-fed stream and impoundment in Deer Draw (10 mi. S and 5 mi. W
Reva). Similar isolated populations may be present in the few other
suitable mesic habitats in Harding County, but we have trapped
extensively, yet unsuccessfully, for _Zapus_ in such situations;
specimens are known, however, from the Long Pine Hills and from along
the Little Missouri River in adjacent Carter County, Montana. It is of
interest that a relict population of _Peromyscus leucopus_ also occurs
in Deer Draw.

The testes of two adult males obtained on June 3 measured 7, whereas
those of one taken on May 16 measured 16. Seven embryos (measuring 8 in
crown-rump length) were carried by a molting female trapped on June 16.
Our specimens of _Zapus_, currently under study by Paul B. Robertson,
appear to be intergrades between the subspecies _campestris_ and
_intermedius_, but resemble the former more closely than the latter.


~Erethizon dorsatum bruneri~ Swenk, 1916

Porcupine

_Specimens examined_ (11).--NW 1/4 sec. 15, R. 5 E, T. 22 N, 1; 2 mi. N,
5 mi. W Ludlow, 3; 4 mi. S, 7 mi. W Ladner, 1; 10 mi. S, 4 mi. W Reva,
1; 10 mi. S, 5 mi. W Reva, 4; 2 mi. S, 5 mi. E Harding, 1.

The porcupine is a common resident of the pine-clad buttes of Harding
County and individuals were occasionally encountered some distance from
pines. We noted porcupines almost nightly in June of 1961 along the road
that parallels the Slim Buttes to the east, and found a number that had
been struck by automobiles along this and other roadways in, or adjacent
to, wooded areas. Visher (1914:90) earlier reported _Erethizon_ from
Harding County.


Order Carnivora


~Canis latrans latrans~ Say, 1823

Coyote

_Specimens examined_ (8).--North Cave Hills, 1; N of Slim Buttes, 1; N
end Slim Buttes, 1; 6 mi. N, 4 mi. W Camp Crook, 2; W of East Short Pine
Hills, 1; E of Short Pine Hills, 1; Sheep Mountain, 1.

The coyote population in Harding County and adjacent areas is low owing
to an active predator control program that is supported by local
ranchers and by state and federal agencies. Our field parties neither
saw nor heard coyotes, although tracks were found at one or two places
in March of 1963. According to Robert Kriege (personal communication),
the few coyotes that do reside in the area find refuge in the most
rugged parts of the hills and buttes. Visher (1914:90) reported that
this carnivore was "generally considered as abundant." Our specimens all
are skulls of individuals killed by a federal trapper in the winter of
1961-62.


~Canis lupus nubilus~ Say, 1823

Gray Wolf

Visher (1914:90) stated that wolves were "quite plentiful" in the early
1900's; he quoted figures for a two-month period in 1910 when a
government trapper took five adults and 25 pups in the vicinity of the
Short Pine Hills and two adults and 11 pups in the general area of the
Cave Hills. According to local residents, wolves were common in Harding
County in the 1920's. One (the famous "Three Toes") trapped 20 mi. NW
Buffalo in July of 1925 had eluded capture for more than 13 years, and
in that period caused an estimated $50,000 in damage to livestock
(Young, 1944:259, 277). It seems likely that the skull of this animal,
in the U.S. National Museum, is the one referred to by Goldman
(1944:445).

Wolves apparently had become rare by about 1930. The last one known to
have been killed in northwestern South Dakota was taken on January 27,
1945, near Red Elm, Ziebach County (Carl Cornell, personal
communication). We have seen a photograph of this wolf, which was
mounted and now is on display in Deadwood, South Dakota.

As noted by Goldman (1944:442), the subspecies _nubilus_ probably is
extinct.


~Vulpes vulpes regalis~ Merriam, 1900

Red Fox

_Specimens examined_ (6).--1 mi. S, 5 mi. E Ladner, 3; 3 mi. S, 12 mi. E
Ludlow, 1; 2 mi. W Camp Crook, 3200 ft., 1; 4 mi. S, 1 mi. E Buffalo, 1.

This fox was present, although apparently not abundant, in Harding
County in the early part of this century (Visher, 1914:90). He reported
knowledge of "two or three" that had been trapped in the county and
further noted a report that red foxes were "not rare along the Lone
Pines." Visher's paper evidently was overlooked by Hall and Kelson
(1959: map 447), who did not include the western half of South Dakota
within the distribution of the species. The only foxes observed by our
field parties were two seen in July of 1970--one an immature animal held
captive in Camp Crook and remains of another that had been killed on a
county road about 18 miles north of that place. Five specimens that had
been killed by hunters were acquired in March 1963 and an isolated skull
was picked up west of Camp Crook in 1970.

There is a continuing demand from sheep ranchers in the county that
foxes be controlled, yet this species seems to maintain considerably
higher populations than does the coyote. According to federal trapper
Robert Kriege (personal communication), dens of the red fox have been
found principally in the badlands and in certain grassland areas, but
rarely in the buttes proper. Records kept by Mr. Kriege indicate that
litters are born in mid-March in Harding County. He estimated that over
the past few years he has examined whelps from an average of 50 dens a
year, but that more than 170 dens were found in the spring of 1963.


~Ursus americanus americanus~ Pallas, 1780

Black Bear

Visher (1914:91) reported that a black bear "was seen near the Cave
Hills in July, 1910." He further noted: "Bears have been recently killed
in the Long Pine and Ekalaka forests [of adjacent Montana], but their
day of extermination is here near at hand." We know of no other reports
of this carnivore from the area.


~Ursus arctos horribilis~ Ord, 1815

Grizzly Bear

According to Visher (1914:91) a grizzly bear was killed in the early
1890's a short distance southwest of Camp Crook.


~Procyon lotor hirtus~ Nelson and Goldman, 1930

Raccoon

_Specimens examined_ (10).--2 mi. N, 5 mi. W Ludlow, 4; 1/2 mi. W Reva,
1; 4 mi. E Reva, 2; NW 1/4 sec. 32, R. 1 E, T. 20 N, 3.

The raccoon evidently is one of the commonest carnivores in Harding
County. On June 24, 1961, a den with three young (average total length,
429) was found in one of the numerous pockets eroded from the caprock of
the North Cave Hills, and on May 21, 1968, another den, this one
containing five young (average total length of three, 271), was found in
a similar situation on the east edge of the Long Pine Hills. A female
trapped on June 20, 1961, was lactating.

Three individuals that had been killed at Ralph, along nearly treeless
Big Nasty Creek, were examined on May 28, 1968.


~Mustela frenata longicauda~ Bonaparte, 1838

Long-tailed Weasel

This mustelid seems uncommon in northwestern South Dakota. The only
recent reports from Harding County that have come to our attention are
of a female and four or five young that were found in a haystack
"several years prior to 1963" (Robert Kriege, personal communication),
and of several individuals seen by a rancher in a hay field along the
Little Missouri about 7 mi. N Camp Crook during mowing operations in
July 1970. Visher (1914:91) regarded the species as "quite common," and
noted that "4 or 5 dead ones" were seen along roads in the summer of
1910.


~Mustela nigripes~ (Audubon and Bachman, 1851)

Black-footed Ferret

In a recent summary of the natural history of this species in South
Dakota, Henderson _et al._ (1969) listed seven localities in Harding
County (all in prairie dog "towns") at which ferrets had been sighted or
trapped as follows (dates in parentheses): near Ladner (March, 1963); 17
mi. N Camp Crook (about 1956 or 1957); T. 20 N, R. 3 E (1964); T. 20 N,
R. 4 E (winter, 1964); T. 19 N, R. 1 E (late November, 1966); T. 17 N,
R. 8 E (summer, 1965); T. 15 N, R. 1 E (winter, 1963). These authors
also reported a specimen in the U.S. National Museum (no. 243990) that
was taken at Govert on November 1, 1923. Additionally, Wesley Broer,
then the local game warden, reported to one of our parties that a ferret
was seen on February 27, 1963, at a place 7 mi. N and 16 mi. W Buffalo.

Visher (1914) made no mention of this species in his report of the
natural history of Harding County.


~Mustela vison letifera~ Hollister, 1913

Mink

Tracks of a mink were observed by a member of one of our field parties
(T. H. Swearingen) in late March of 1963 at a pond 5 mi. S and 14 mi. E
Buffalo, and one was reported to have been trapped in the same area the
previous winter. Reports by local residents indicate that mink occur
along the Little Missouri River as well as streams on the north side of
the North Cave Hills. Visher (1914:91) reported the species to be
uncommon but he knew of one trapped in February of 1911 on Bull Creek.


~Taxidea taxus taxus~ (Schreber, 1778)

Badger

_Specimens examined_ (4).--Sec. 25, R. 3 E, T. 22 N, 1; NE 1/4 sec. 28,
R. 4 E, T. 19 N, 1; 4 mi. E Reva, 1; 10 mi. S, 2 mi. W Buffalo, 1.

Local residents regarded the badger as relatively common in the
grasslands of Harding County, although this species was only rarely
observed by members of our field parties. Visher (1914:91) reported it
to be "quite common."


~Spilogale putorius interrupta~ (Rafinesque, 1820)

Spotted Skunk

We took no spotted skunks in northwestern South Dakota and both local
residents and government trappers reported this species to be rare in
the area. Visher (1914:91) indicated that it was "much more common than
the large skunk" in the early part of this century.


~Mephitis mephitis hudsonica~ Richardson, 1829

Striped Skunk

Visher (1914:91) found this species to be "uncommon" in Harding County,
as we did more than a half century later. Some local residents, however,
reported this skunk to be fairly abundant. We took one specimen, an
adult female having enlarged mammae that was captured on July 6, 1965,
at a place 7 mi. S and 4-1/2 mi. E Harding, just south of the Short Pine
Hills. Site records of several other striped skunks were obtained as
follows: 14 mi. N Buffalo; 6 mi. N and 2-1/2 mi. W Camp Crook; 5-1/2 mi.
WNW Buffalo; 1-1/2 mi. S and 1/2 mi. E Buffalo; 4 mi. S Buffalo; 10 mi.
SW Ralph; and 1 mi. S Reva.


~Lutra canadensis interior~ Swenk, 1920

Otter

We have no record of this species in Harding County other than Visher's
(1914:91) report that an individual was "recently trapped along the
Little Missouri River."


~Felis concolor hippolestes~ Merriam, 1897

Mountain Lion

This large cat likely occurred throughout northwestern South Dakota
prior to settlement by white man. No specimens are available from
Harding County, but Visher (1914:91) reported that an individual
"visited the East Short Pines in the winter of 1910-11." It is doubtful
that _Felis concolor_ occurs in the area today, except possibly as an
occasional transient.


~Lynx rufus pallescens~ Merriam, 1899

Bobcat

_Specimens examined_ (3).--12 mi. N, 9 mi. W Buffalo, 1; 11 mi. N, 7 mi.
W Buffalo, 1; 9 mi. N, 9 mi. W Buffalo, 1.

The bobcat, although not abundant, is generally distributed throughout
Harding County, particularly in the buttes and badlands. Visher
(1914:90) reported the species as common in the early part of this
century. Our three specimens were shot in March 1963 by professional
hunters sponsored by the Western South Dakota Sheepman Association, two
from the air and one on the ground. Two other bobcats were killed in the
same three-day period (March 25-27).

We tentatively assign our specimens to the subspecies _pallescens_ owing
to their pale color and the general agreement of their external and
cranial measurements with those reported for other specimens of that
race. Geographic variation in _Lynx rufus_ from throughout the Northern
Great Plains is poorly documented, however, and is in need of critical
analysis. External measurements of the three specimens, all males (adult
and two young adults, respectively), are: total length, 870, 925, 820;
length of tail, 142, 176, 155; length of hind foot, 191, 192, 178;
length of ear, 82, 84, 71; weight (pounds), 23, 17, 16. Respective
lengths of testes were 30, 36, and 15. Selected cranial measurements of
the adult and largest young adult are: condylobasal length, 113.7,
111.5; zygomatic breadth, 88.3, 83.7; interorbital constriction, 24.5,
23.5; length of nasals, 30.1, 30.8; length of maxillary toothrow, 37.7,
38.6.


Order Artiodactyla


~Cervus elaphus canadensis~ Erxleben, 1777

Wapiti or Elk

Visher (1914:87) reported that the last native elk in Harding County was
killed in the Long Pine Hills in 1879, and also mentioned skulls picked
up in the Cave Hills. The origin of a wapiti allegedly shot in the Slim
Buttes in 1956 (Robert Kriege, personal communication) is unknown, but
presumably this individual was a wanderer, possibly from the Black Hills
to the south where elk were reintroduced some years ago.


~Odocoileus hemionus hemionus~ (Rafinesque, 1817)

Mule Deer

_Specimens examined_ (6).--2 mi. N, 5 mi. W Ludlow, 1; 9 mi. N, 10 mi. W
Buffalo, 2; 10 mi. S, 5 mi. W Reva, 3.

The mule deer is common in the buttes and adjacent badland areas of the
county, and many were seen by members of each of our field parties.
Local residents reported "black-tails" to be widespread in the area and
State Game Protector Merritt Paukarbek reported to Andersen that even
though hunting success was high in the autumn of 1967, there was no
apparent reduction in numbers in the spring of 1968. In contrast, Visher
(1914:88) found this species absent in Harding County in the early
1900's, and stated that it was "exterminated by 1900."

An adult female taken on June 26, 1961, in the North Cave Hills was
molting and evidenced no indication of reproductive activity.


~Odocoileus virginianus dacotensis~ Goldman and Kellogg, 1940

White-tailed Deer

_Specimen examined_ (1).--8-1/2 mi. N, 1-1/2 mi. E Camp Crook, 1.

The white-tailed deer is less abundant in northwestern South Dakota
than is _O. hemionus_, but a number were seen by members of our parties
(in Deer Draw of the Slim Buttes, for example), and local residents
reported many sightings to us. Visher (1914:82) earlier recorded this
species as once "fairly plentiful in the forest reserves" in Harding
County, but stated that it had become rare when he made his biological
survey of the area in 1910 and 1912.


~Antilocapra americana americana~ (Ord, 1815)

Pronghorn


_Specimens examined_ (2).--Sec. 28, R. 8 E, T. 23 N, 1; 12 mi. S, 10 mi.
W Buffalo, 1.

This species is the most conspicuous (and possibly the most abundant)
ungulate in Harding County. It ranges throughout the county on flat and
rolling grasslands where small groups, and occasionally herds of up to
50 individuals, were seen in 1960, 1961, 1963, 1968, and 1970. Visher
(1914:88) reported that the pronghorn was common in the area until about
1900, but that it was near the point of extinction when he visited the
county in 1910 and 1912.


~Bison bison bison~ (Linnaeus, 1758)

Bison

According to historical accounts (Anonymous, 1959), the bison was rare
or absent in Harding County at the time of settlement in 1876. By the
early 1880's, however, herds were of regular occurrence, and there is
one record (_op. cit._: 95-96) of thousands crossing the Little Missouri
near Camp Crook in November of 1882.

One report has it that the last bison killed in the county was shot in
the summer of 1884 (_op. cit._: 73-74), but Visher (1914:88) reported
that an "old settler" had seen "a small bunch in 1886." Visher also
reported finding bison remains, probably in 1910 or 1912, to the
northeast of the North Cave Hills and west of the South Cave Hills.


~Ovis canadensis auduboni~ Merriam, 1901

Mountain Sheep

According to Visher (1914:88), mountain sheep formerly inhabited all the
areas of buttes in Harding County but were extirpated in the 1890's.
Sheep Mountain, a large butte just below the south end of the Slim
Buttes, was reported to be the last area in which these animals
occurred. Over and Churchill (1945:54) mentioned both the Cave Hills and
Slim Buttes as localities formerly inhabited by _O. c. auduboni_.

Early in 1961, the South Dakota Game Commission introduced 12 animals,
four rams and eight ewes, from Alberta (subspecies _O. c. canadensis_)
on the Slim Buttes, but none is known to have survived to 1968.


SPECIES OF UNVERIFIED OCCURRENCE

The ten species of mammals listed below are not known certainly to occur
in Harding County, but there is a strong likelihood that some will be
found in the area or once occurred there. Three were mentioned by Visher
(1914) as having been seen or taken in the county at the time of, or
prior to, his biological survey of 1910 and 1912, but his accounts were
not supported by adequate documentation. In addition to the kinds
listed, several other mammals, such as Keen's bat (_Myotis keenii
septentrionalis_), the red bat (_Lasiurus borealis borealis_), or the
least weasel (_Mustela nivalis campestris_) are known to occur near
enough to the area that the possibility of their presence cannot be
discounted.

~Sorex cinereus haydeni~ Baird, 1858.--No shrews presently are known from
Harding County. This species almost certainly will be found in
relatively mesic habitats there, however, as our field parties have
taken specimens in adjacent Bowman County, North Dakota, and only a few
miles to the west of the county in the Long Pines Hills of Montana.

~Sorex merriami merriami~ Dobson, 1890.--This shrew inhabits somewhat more
xeric areas than most other members of the genus and surely occurs in
northwestern South Dakota. Specimens are on record from western North
Dakota and northwestern Nebraska, and in the summer of 1970 a field
party from The University of Kansas took one but a half mile west of the
Harding County (state) line in Carter County, Montana.

~Spermophilus richardsonii richardsonii~ (Sabine, 1822).--Visher (1914:88)
reported that he saw individuals of this species "in the extreme
northwestern corner" of Harding County. However, the limits of the
presently known range of the species are approximately 150 miles distant
from that area.

~Sciurus niger rufiventer~ E. Geoffroy St.-Hilaire, 1803.--The fox
squirrel presently is unrecorded from much of the West River part of
South Dakota. Hoffmann _et al._ (1969:589), however, recently have
reported specimens from along the Yellowstone River in eastern Montana
and this squirrel now may occur also along the Little Missouri River. It
was not surprising, therefore, when residents of Camp Crook reported to
us that in recent years they have seen what were believed to be fox
squirrels along the Little Missouri near that town. Specimens now are
needed to verify these reports.

~Lagurus curtatus pallidus~ (Merriam, 1888).--The sagebrush vole
undoubtedly occurs, albeit probably uncommonly, in areas of sage in
northwestern Harding County, because specimens have been taken recently
a few miles north and west of the county in North Dakota and Montana,
respectively. We trapped unsuccessfully (900 trap nights) for this vole
on sage flats to the north of Camp Crook and west of the Little Missouri
River in the summer of 1970. "Sign," which appeared to be that of
_Lagurus_, was found in this area, but only _Peromyscus maniculatus_ and
_Spermophilus tridecemlineatus_ were trapped there.

~Rattus norvegicus~ (Berkenhout, 1769).--No records of this introduced
murid are available from northwestern South Dakota, but it seems likely
that the species has reached the area.

~Vulpes velox~ (Say, 1823).--Visher (1914:90) reported seeing a swift fox
"along the Little Missouri Valley in North Dakota" and further noted
that an early settler [Sol Catron] had "trapped a few" in Harding
County. Whatever the former status of this fox in northwestern South
Dakota may have been, the species evidently does not occur in the area
today, or is rare, and the subspecific status of _V. velox_ throughout
much of the Northern Great Plains is in question. A specimen obtained
in February of 1970 at a place 9 mi. N and 2 mi. E Scranton, Slope Co.,
North Dakota, is the only swift fox taken north of Nebraska in recent
years (Pfeifer and Hibbard, 1970:835).

~Urocyon cinereoargenteus ocythous~ Bangs, 1899.--Jones and Henderson
(1963:288) reported a gray fox from Deer Ear Buttes, Butte Co., South
Dakota, approximately 15 miles south of the Harding County line. This
species appears to have dispersed westward in recent years, and its
future occurrence in the county is likely.

~Gulo gulo luscus~ (Linnaeus, 1758).--The wolverine probably occurred
sparingly in northwestern South Dakota until the time of early
settlement, but we know of no verified records from Harding County or
surrounding areas. A recent report of a specimen taken south of Timber
Lake, Dewey Co., South Dakota (Jones, 1964:283), indicates that it may
again be found in the area.

~Lynx canadensis canadensis~ Kerr, 1792.--We have no reports of this
species in Harding County save that Visher (1914:90) noted that local
residents claimed specimens had "been taken recently in the Cave Hills."
Hoffmann and Pattie (1968:53) reported that the lynx occurs presently in
eastern Montana and we suspect that individuals may occasionally range
into Harding County.


ZOOGEOGRAPHIC COMMENTS

Of the 53 mammals listed in the foregoing accounts, all but one (_Mus
musculus_) are native North American species. These fall into five
rather well-defined faunal groupings as outlined by Hoffmann and Jones
(1970:364-365). A majority (27) can be characterized as "widespread
species." Most of these have broad distributions over much of North
America; a few do not, but are widely enough distributed that it is
impossible to assign them with certainty to a more circumscribed
assemblage. Mammals from northwestern South Dakota that can be
characterized as widespread are: _Myotis leibii_, _Myotis lucifugus_,
_Eptesicus fuscus_, _Lasionycteris noctivagans_, _Lasiurus cinereus_,
_Castor canadensis_, _Peromyscus maniculatus_, _Ondatra zibethicus_,
_Erethizon dorsatum_, _Canis latrans_, _Canis lupus_, _Vulpes vulpes_,
_Ursus americanus_, _Ursus arctos_, _Procyon lotor_, _Mustela frenata_,
_Mustela vison_, _Taxidea taxus_, _Mephitis mephitis_, _Lutra
canadensis_, _Felis concolor_, _Lynx rufus_, _Cervus elaphus_,
_Odocoileus hemionus_, _Odocoileus virginianus_, _Antilocapra
americana_, and _Bison bison_. The above list is composed mainly of
volant or relatively large and mobile mammals, several of which occur
also in Eurasia or range well into the Neotropics.

A few widespread species deserve special comment. Two, the pronghorn and
bison, are typical inhabitants of the interior grasslands of North
America and might be considered steppe species save for the fact that
each has an extensive distribution beyond that region. Four other
species, _Erethizon dorsatum_, thought of primarily as a mammal of
coniferous forests, and _Ursus arctos_, _Taxidea taxus_, and
_Odocoileus hemionus_, all more or less western taxa, are not so broadly
distributed as are other members of this grouping. Of the five bats,
three are year-round residents, but _Lasiurus cinereus_ and evidently
_Lasionycteris noctivagans_ are migrants.

The remaining 25 kinds of mammals are representative of four regional
faunal groupings as follows: boreomontane species (10), steppe species
(nine), species with Sonoran affinities (four), and species of the
eastern deciduous forest (two).

_Boreomontane species._--Of the 10 mammals in this faunal group, three
(_Eutamias minimus_, _Tamiasciurus hudsonicus_, and _Microtus
pennsylvanicus_) are distributed both in the boreal forests to the north
of the plains and in montane areas to the west. Six species (_Myotis
evotis_, _Myotis volans_, _Plecotus townsendii_, _Thomomys talpoides_,
_Neotoma cinerea_, and _Ovis canadensis_) are primarily montane in
distribution and evidently reached northwestern South Dakota from the
west in late Wisconsin or post-glacial times; all but the pocket gopher
occur there now only in the vicinity of coniferous timber or rocky
buttes. The remaining species, _Zapus hudsonius_, is a glacial "relic."
The nearest populations now are far to the north, and this jumping mouse
occupies only restricted habitats in northwestern South Dakota and
adjacent regions. In Harding County, _Z. hudsonius_ presently is known
only from Deer Draw in the Slim Buttes.

_Steppe species._--Taxa intimately associated with the Great Plains are:
_Lepus townsendii_, _Cynomys ludovicianus_, _Spermophilus
tridecemlineatus_, _Perognathus fasciatus_, _Perognathus hispidus_,
_Reithrodontomys montanus_, _Microtus ochrogaster_, _Mustela nigripes_,
and _Spilogale putorius_ (subspecies _interrupta_). A few of these are
endemic to the plains, but most occur in grassland habitats beyond the
borders of the region. All clearly are well adapted to, and therefore
presumably evolved in response to, the environment of the interior
grasslands; this zoogeographic unit, then, is characterized by truly
steppe species that have relatively narrow habitat requirements and
largely concordant patterns of distribution.

The case of the spotted skunk deserves brief commentary. This species
was not taken or observed by members of our field parties and local
residents made no claim to its presence except for a few vague
recollections of spotted skunks having been seen "years ago." Visher
(1914:91), however, reported that _Spilogale_ was much commoner than
_Mephitis_ in the early part of the century. However that may have been,
_Spilogale putorius_, as currently understood, would be judged to be a
widespread species except that recent evidence strongly suggests that
the plains race (_interrupta_) is not of the same species as spotted
skunks to the west (subspecies _gracilis_). Furthermore, the ranges of
the two are not in contact. Whatever its ultimate specific affinities
may be, _S. p. interrupta_ clearly is a plains mammal, and thus is here
considered in that zoogeographic unit.

_Sonoran species._--_Sylvilagus audubonii_, _Dipodomys ordii_,
_Reithrodontomys megalotis_, and _Onychomys leucogaster_ are invaders to
the Northern Great Plains from the Sonoran region to the southwest. The
latter two, however, are rather broadly distributed on the Great Plains
and their assignment as Sonoran species is somewhat arbitrary. It is of
interest that as many as nine mammals with southwestern affinities occur
as far north as southwestern South Dakota and adjacent Wyoming.

_Eastern species._--Only _Sylvilagus floridanus_ and _Peromyscus
leucopus_ can be identified as species primarily associated with the
eastern deciduous forest. The former is limited in northwestern South
Dakota to brushy habitats in riparian communities, whereas _P. leucopus_
is restricted to relatively good stands of deciduous timber and
presently is known to occur only in Deer Draw of the Slim Buttes.

Throughout its known range in the western part of the Northern Great
Plains, _P. leucopus_ is represented by small and disjunct populations
associated with riparian deciduous timber. The known population nearest
to Harding County is on the Black Hills to the south; next nearest are
several isolated or semi-isolated populations along the Yellowstone
River in eastern Montana. Presumably, this white-footed mouse spread
northwestward into the western part of the plains region along river
systems, in company with deciduous trees, in some post-glacial period
when the climate was warmer and wetter than now. Subsequent drying
altered substantially the distribution and perhaps composition of
riparian forests, and isolated populations of _P. leucopus_ evidently
survived only in restricted areas, such as Deer Draw, many of them
probably marginal habitat for the species.

_Unverified species._--If the 10 species listed as of "unverified
occurrence," it seems highly likely that as many as eight will be found
to occur, or occurred within historic time, in Harding County. Among
these eight are one steppe species (_Vulpes velox_), three with
boreomontane affinities (_Sorex cinereus_, _Gulo gulo_, and _Lynx
canadensis_), two (_Sciurus niger_ and _Urocyon cinereoargenteus_) that
are associated with the eastern deciduous forests, and two (_Sorex
merriami_ and _Lagurus curtatus_) that are Great Basin elements.

It is noteworthy that the last-mentioned faunal unit is not known to be
represented in northwestern South Dakota.


ACKNOWLEDGMENTS

For assistance in the field, we are especially grateful to the students
who were enrolled in the Field Course in Vertebrate Zoology at The
University of Kansas in the summers of 1961, 1965, and 1970, and to M.
A. Levy, R. R. Patterson, and T. H. Swearingen. In 1965 and 1970, the
summer field course was supported in part by grants (GE-7739 and
GZ-1512, respectively) from the National Science Foundation; Andersen
was supported in the field in 1968 by a grant from the Kansas City
Council for Higher Education. Personnel of the U.S. Forest Service
(Sioux Division, Custer National Forest), particularly District Ranger
Timothy S. Burns, were most helpful to us in the field, as were Wardens
Wesley Broer and Merritt Paukarbek of the South Dakota Department of
Game, Fish and Parks. Robert Kriege, Federal predator control agent
stationed in Buffalo, was most generous in sharing with us his knowledge
of rodents and carnivores in the area, and many present or former
residents, particularly Carl Cornell and Spike Jorgensen, also provided
useful information and were helpful in other ways.

Ectoparasites reported here were identified by Cluff E. Hopla (fleas),
Richard B. Loomis (chiggers), and Glen M. Kohls (ticks). Other than
mammals housed in the Museum of Natural History, we examined only three,
two in the U.S. National Museum (USNM) and one in the collection at
South Dakota State University, Brookings (SDSU).




LITERATURE CITED


ANONYMOUS

1959. Building an empire: a historical booklet on Harding County, South
Dakota. Buffalo Times-Herald, 108 pp.


BAILEY, V.

1915. Revision of the pocket gophers of the genus Thomomys. N. Amer.
Fauna, 39:1-136.

1927. A biological survey of North Dakota. N. Amer. Fauna, 49: vi +
1-226 [this publication is dated 1926, but actually was published on
January 8, 1927].


BAKER, C. L.

1952. Geology of Harding County. Rept. South Dakota State Geol. Surv.,
68:1-36 (mimeographed).


BROWN, L. N.

1963. Maturational molts and seasonal molts in Peromyscus boylii. Amer.
Midland Nat., 70:466-469.


COLLINS, H. H.

1918. Studies of normal moult and of artificially induced regeneration
of pelage in Peromyscus. Jour. Exp. Zool., 27:73-99.


GOLDMAN, E. A.

1944. Classification of wolves. Pp. 387-507, _in_ The wolves of North
America (S. P. Young and E. A. Goldman), Amer. Wildlife Inst.,
Washington, D.C., xx + 636 pp.


HALL, E. R., and K. R. KELSON

1959. The mammals of North America. Ronald Press, New York, 2: xxx +
1-546 + 79 and 2: viii + 547-1083 + 79.


HENDERSON, F. R., P. F. SPRINGER, and R. ADRIAN

1969. The black-footed ferret in South Dakota. South Dakota Dept. Game,
Fish and Parks, Pierre, 37 pp.


HOFFMANN, R. S., and J. K. JONES, JR.

1970. Influence of late-glacial and post-glacial events on the
distribution of Recent mammals on the Northern Great Plains. Pp.
355-394, _in_ Pleistocene and Recent environments of the Central Great
Plains (W. Dort, Jr., and J. K. Jones, Jr., eds.), Univ. Press of
Kansas, Lawrence, xii + 433 pp.


HOFFMANN, R. S., and D. L. PATTIE

1968. A guide to Montana mammals.... Univ. Montana, Missoula, x + 133
pp.


HOFFMANN, R. S., P. L. WRIGHT, and F. E. NEWBY

1969. Distribution of some mammals in Montana. I. Mammals other than
bats. Jour. Mamm., 50:579-604.


HOFFMEISTER, D. F.

1951. A taxonomic and evolutionary study of the pinon mouse, Peromyscus
truei. Illinois Biol. Monogr., 21: ix + 1-104.


JONES, J. K., JR.

1964. Distribution and taxonomy of mammals of Nebraska. Univ. Kansas
Publ., Mus. Nat. Hist., 16:1-356.


JONES, J. K., JR., and H. H. GENOWAYS

1967. Annotated checklist of bats from South Dakota. Trans. Kansas Acad.
Sci., 70:184-196.


JONES, J. K., JR., and F. R. HENDERSON

1963. Noteworthy records of foxes from South Dakota. Jour. Mamm.,
44:283.


LILLEGRAVEN, J. A.

1970. Stratigraphy, structure, and vertebrate fossils of the Oligocene
Brule Formation, Slim Buttes, northwestern South Dakota. Bull. Geol.
Soc. Amer., 81:831-850.


MILLER, G. S., JR., and R. KELLOGG

1955. List of North American Recent mammals. Bull. U.S. Nat. Mus., 205:
xii + 1-954.


OVER, W. H., and E. P. CHURCHILL

1945. Mammals of South Dakota. Univ. South Dakota Mus., 56 pp.
(mimeographed).


PFEIFER, W. K., and E. A. HIBBARD

1970. A recent record of the swift fox (_Vulpes velox_) in North Dakota.
Jour. Mamm., 51:835.


SWENK, M. H.

1941. A study of subspecific variation in the Richardson pocket gopher
(Thomomys talpoides) in Nebraska, with description of two new
subspecies. Missouri Valley Fauna, 4:1-8.


VISHER, S. S.

1914. Report on the biology of Harding County, northwestern South
Dakota. Bull. South Dakota Geol. Surv., 6:1-103.


YOUNG, S. P.

1944. Their history, life habits, economic status, and control. Pp.
1-385, _in_ The wolves of North America (S. P. Young and E. A. Goldman),
Amer. Wildlife Inst., Washington, D.C., xx + 636 pp.