_Big Horn Co._: 12 mi. E and 2 mi. S Sh.e.l.l, 7,900 ft., 2; 13 mi. E and 2 mi. N Sh.e.l.l, 8,500 ft., 2; 13 mi. E Sh.e.l.l, 8,300 ft., 1; 17 mi. E and 3 mi. S Sh.e.l.l, 9,000 ft., 8; 17-1/2 mi. E and 4-1/2 mi. S Sh.e.l.l, 8,500 ft, 11; 19 mi. E and 4-1/2 mi. S Sh.e.l.l, 9,600 ft., 1; 9 mi. E and 9 mi. N Tensleep, 8,200 ft., 4.

_Sheridan Co._: Medicine Wheel Ranch, 9,000 ft., 28 mi. E Lovell, 11; 38 mi. E Lovell, Big Horn Nat. For., 9,600 ft., 10; 5-1/2 mi. W and 1-1/2 mi. S Junction U.S. Highway 14 and Wyoming [State Highway] 14, 8,480 ft., 2.

_Washakie Co._: 9 mi. E and 4 mi. N Tensleep, 7,000 ft., 26; 3 mi.

SE Tensleep, 4,300 ft., 1.

_Johnson Co._: 5-1/2 mi. W and 1 mi. S Buffalo, 6,500 ft., 4; 7-1/2 mi. W and 1 mi. S Buffalo, 6,500 ft., 2.

_Additional records_ (Howell 1929:46): _Sheridan Co._: 20 mi. from Sheridan. _Washakie Co._: Head of Canyon Creek. _Johnson Co._: Head of North Fork of Powder River.

Eutamias minimus silvaticus White

_Eutamias minimus silvaticus_ White, Univ. Kansas Publ. Mus. Nat.

Hist. 5 (19):259-262, April 10, 1952.

_Type._--Female, adult, skull and skin, No. 20050 (KU); from 3 mi.

NW Sundance, 5,900 ft., Crook County, Wyoming; obtained on July 4, 1947, by H. W. Setzer; original No. 1692.

_Diagnosis._--Size large; over-all tone of upper parts brownish gray; sides Ochraceous Buff; baculum as in _E. m. pallidus_.

_Description._--_Color pattern_: Crown Sayal Brown washed with Cinnamon Buff; facial stripes Fuscous Black mixed with Clay Color; anterior margin of ear Ochraceous-Orange; hairs inside posterior part of pinna Ochraceous Buff; posterior margin of ear and postauricular patch grayish white; dorsal dark stripes Fuscous Black more or less mixed with Ochraceous Buff; medial dorsal light stripes Pale Smoke Gray with Ochraceous Buff along margins; lateral dorsal light stripes grayish white or white with Ochraceous Buff along margins; sides Ochraceous Buff; rump and thighs Smoke Gray washed with Ochraceous Buff; dorsal surface of tail black interspersed with Ochraceous Buff; ventral surface of tail Ochraceous-Orange, with black along margin and Light Ochraceous Buff along outermost edge; antipalmar and antiplantar surfaces of feet Light Buff; underparts creamy white sometimes washed with Ochraceous Buff. _Skull_ and _Baculum_: Large but of same proportions as in other subspecies of _E. minimus_.

_Comparisons._--From _E. m. operarius_, the subspecies from south-central Wyoming, _E. m. silvaticus_ differs in: Underside of tail lighter; general tone of upper parts grayer; sides lighter; skull and baculum of same size and proportions.

For comparisons with _E. m. pallidus_ and _E. m. confinis_, see the accounts of those subspecies.

_Remarks._--Intergradation between _E. m. silvaticus_ and _E. m.

pallidus_ has already been discussed under the account of _E. m.

pallidus_.

_Specimens examined._--Total number, 42.

_Crook Co._: 15 mi. N Sundance, Black Hills Nat. Forest, 5,500 ft., 6; 15 mi. ENE Sundance, 3,825 ft., 1; 3 mi. NW Sundance, 5,900 ft., 14; 1 mi. N Sundance, Black Hills Nat. Forest, 1.

_Weston Co._: 1-1/2 mi. E Buckhorn, 6,150 ft., 19; SE Newcastle, 1 (MM).

_Additional records_ (Howell 1929:57): _Crook Co._: Devils Tower; Sundance.

Eutamias minimus operarius Merriam

_Eutamias amoenus operarius_ Merriam, Proc. Biol. Soc. Washington, 18:164, June 29, 1905.

_Eutamias minimus operarius_, Howell, Jour. Mamm. 3:183, August 4, 1922.

_Type._--Female, adult, skull and skin, No. 129808 (BS); from Gold Hill, 7,400 ft., Boulder County, Colorado; obtained on October 8, 1903, by Vernon Bailey; original No. 8160.

_Diagnosis._--Size large; general tone of upper parts dark reddish brown; sides Tawny or Ochraceous Tawny; baculum large, as in _E. m.

pallidus_.

_Description._--_Color pattern_: Crown Cinnamon Buff mixed with Pale Smoke Gray; facial stripes Fuscous Black mixed with Sayal Brown; anterior margin of ear and hairs inside posterior part of pinna Cinnamon Buff; posterior margin of ear and postauricular patch Pale Smoke Gray; dorsal dark stripes black with Ochraceous Tawny along margins; median dorsal light stripes Pale Smoke Gray with Ochraceous Tawny along margins; lateral dorsal light stripes white; sides Tawny or Ochraceous Tawny; rump and thighs Light Grayish Olive; dorsal surface of tail Fuscous Black slightly mixed with Clay Color; ventral surface of tail Sayal Brown or Ochraceous Tawny with Fuscous Black along margin and Clay Color along outermost edge; antipalmar and antiplantar surfaces of feet Ochraceous Buff; underparts grayish white, often washed with Buff.

_Skull_ and _Baculum_: Large but of same proportions as in other subspecies of _E. minimus_.

_Comparisons._--For comparisons with _E. m. minimus_, _E. m.

pallidus_, _E. m. confinis_, and _E. m. silvaticus_, see the accounts of those subspecies.

_Remarks._--Specimens from the mountains near Savery in Carbon County and from near Medicine Bow Peak in Carbon and Albany counties are clearly referable to this race on the basis of color pattern. However, in the skull and baculum these specimens resemble _E. m. minimus_.

Specimens from the Laramie Range, 27 mi. N Laramie, show a color pattern which tends toward that of _E. m. pallidus_.

_Specimens examined._--Total number, 118.

_Natrona Co._: 2 mi. W and 7 mi. S Casper, 6,370 ft., 2; 10 mi. S Casper, 7,750 ft., 3; 6 mi. S and 2 mi. W Casper, 5,900 ft., 1.

_Converse Co._: 21-1/2 mi. S and 24-1/2 mi. W Douglas, 7,600 ft., 10.

_Carbon Co._: Lake Marie, 10,440 ft., 1; 2 mi. S and 1/2 mi. W Medicine Bow Peak, 10,400 ft., 1; 2 mi. S and 2 mi. W Medicine Bow Peak, 10,700 ft., 1; 10 mi. N and 14 mi. E Encampment, 8,000 ft., 2; 8 mi. N and 14 mi. E Encampment, 8,400 ft., 2; 8 mi. N and 16 mi. E Encampment, 8,400 ft., 3; 21-1/2 mi. E and 8 mi. N Encampment, 9,400 ft., 2; 10 mi. E and 6 mi. S Saratoga, 8,800 ft., 1; 8 mi. N and 19-1/2 mi. E Savery, 8,800 ft., 16; 17 mi. E and 7 mi. N Savery, 8,300 ft., 1; 7 mi. N and 19 mi. E Savery, 10,128 ft., 1; 14 mi. E and 6 mi. N Savery, 8,400 ft., 1; 5 mi. N and 5 mi. E Savery, 6,900 ft., 2.

_Albany Co._: 27 mi. N and 7-1/2 mi. E Laramie, 6,960 ft., 12; 13 mi. E and 9 mi. N Laramie, 7,700 ft., 2; 8-3/4 mi. E and 6-1/2 mi.

S Laramie, 8,200 ft., 1; 5-1/2 mi. ESE Laramie, 8,500 ft., 1; 8 mi.

E and 4 mi. S Laramie, 8,600 ft, 1; 2 mi. SE Pole Mountain, 8,200 ft., 19; 3 mi. S Pole Mountain, 8,100 ft., 2; 1 mi. SSE Pole Mountain, 8,350 ft., 3; 3 mi. ESE Browns Peak, 10,000 ft., 15; 2-1/2 mi. ESE Browns Peak, 10,300 ft., 1.

_Laramie Co._: 5 mi. W Horse Creek P.O., 7,200 ft., 2; 3-1/2 mi. W Horse Creek P.O., 7,000 ft., 3; 2 mi. W Horse Creek P.O., 6,600 ft., 1.

_Additional records_ (Howell 1929:51): _Natrona Co._: Casper Mountains, 7 mi. S Casper. _Carbon Co._: Bridger Peak; Riverside.

_Albany Co._: Springhill, 12 mi. N Laramie Peak; Eagle Peak; Bear Creek, 3 mi. SW Eagle Peak; Laramie Mountains, 10 mi. E Laramie; Woods [= Woods Landing]; Sherman. _Laramie Co._: Bluffs near Pole Creek; 6 mi. W Islay.

TABLE 1

Average and Extreme Measurements in Millimeters of Adult Chipmunks that Occur in Wyoming

Table Legend:

Col. A: Greatest length of skull Col. B: Zygomatic breadth Col. C: Cranial breadth Col. D: Length of nasals Col. E: Total length Col. F: Length of tail Col. G: Length of lower tooth-row Col. H: Condylo-alveolar length of mandible

--------------+------+------+------+------+-----+-------+------+-------+

A

B

C

D

E

F

G

H

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. minimus_, S of Bitter Creek, Sweet.w.a.ter Co.

Mean (5)

29.9

16.7

14.8

9.0

188

84.6

4.65

5.51

Min. [Male]

29.0

16.5

14.6

8.6

177

81.0

4.52

15.11

Max.

30.9

17.2

15.0

9.8

197

89.0

4.80

16.21

Mean (6)

30.1

17.2

15.1

8.6

193

85.3

4.69

16.08

Min. [Female]

29.0

16.8

14.9

7.9

184

80.0

4.53

15.71

Max.

30.8

17.7

15.5

9.4

200

93.0

4.91

16.58

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. consobrinus_, near Jackson, Teton Co.

Mean (4)

30.1

16.6

14.4

8.6

190

83.0

4.48

15.65

Min. [Female]

29.6

16.4

14.3

8.5

190

80.0

4.43

15.28

Max.

30.7

16.9

14.6

8.8

192

86.0

4.59

15.99

Mean (6)

30.8

17.1

14.5

9.1

200

88.4

4.60

16.05

Min. [Female]

30.2

16.9

14.1

8.7

195

85.0

4.43

15.60

Max.

31.3

17.5

15.1

9.5

205

92.0

4.84

16.70

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. pallidus_, Moorcroft and Rockypoint, Weston Co.

Mean (9)

31.8

18.0

15.3

9.3

193

85.8

4.84

16.74

Min. [Male]

31.4

17.7

14.9

8.5

185

80.0

4.34

16.23

Max.

32.5

18.7

15.9

9.7

204

91.0

5.02

17.21

Mean (7)

32.2

18.2

15.5

9.6

205

91.0

4.97

17.02

Min. [Female]

31.4

17.8

15.1

9.1

203

86.0

4.70

16.30

Max.

32.9

18.9

16.0

10.3

214

99.0

5.18

17.39

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. confinis_, Bighorn Mts., near Tensleep, Washakie Co.

Mean (9)

31.6

17.8

15.4

9.3

205

89.6

4.78

16.71

Min. [Male]

30.4

17.2

14.9

8.9

194

79.0

4.51

16.18

Max.

33.3

19.0

16.2

9.9

228

113.0

5.09

17.70

Mean (8)

32.4

18.7

15.6

9.6

208

88.8

4.83

17.09

Min. [Female]

31.7

17.9

15.3

9.2

189

76.0

4.69

16.49

Max.

33.1

19.3

16.1

9.7

226

103.0

4.93

17.73

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. silvaticus_, 16 mi. N Custer, Pennington Co., S.D.

Mean (19)

32.3

18.2

15.5

9.6

200

86.2

4.85

16.78

Min. [Male]

31.5

17.4

15.0

9.1

189

76.0

4.63

16.19

Max.

33.4

19.4

16.1

10.2

210

94.0

5.13

17.74

Mean (15)

32.6

18.1

15.7

9.5

208

90.2

4.96

16.90

Min. [Female]

31.5

17.7

15.0

9.1

189

70.0

4.61

16.26

Max.

33.7

19.2

16.2

10.5

220

105.0

5.29

18.28

--------------+------+------+------+------+-----+-------+------+-------+ _E. m. operarius_, near Pole Mt., Albany Co.