FIELD BOOK OF MAMMALS 



pelage much like summer. Total length, males and females, 

 8.5 inches; tail vertebrae, 2.4 inches; hind foot, 1.15 inches. 

 Found on "Plains of Saskatchewan and Alberta; south in 

 Montana to Great Falls and the Big Snowy Mountains." 

 (Bailey) 



Prairie Pocket Gopher or Dakota Pocket Gopher. — Thomomys 

 talpoides rufescens (Wied). 

 Larger and darker than typical talpoides. Upperparts 

 (summer) dull brownish gray ; black about ear and on ear ; 

 underparts buffy gray, whitish to pure white from chin to 

 breast. Winter pelage grayer than summer. Total length, 

 males and females, 9.2 inches; tail vertebras, 2.8 inches; 

 hind foot, 1,24 inches. Found in "Greater part of North 

 Dakota, eastern South Dakota, and southwestern Mani- 

 toba." (Bailey) 



Coues Pocket Gopher. — Thomomys talpoides clusius (Coues). 

 Smaller than typical talpoides, claws more slender; more 

 rufescent in color. Upperparts (summer) light buffy vary- 

 ing to hazel, washed with gray; crown brighter than sides; 

 gray on cheeks, blackish about ears; underparts whitish to 

 buffy, with occasionally white on chin. Winter pelage dull 

 hazel washed with grayish or buffy brown. Total length, 

 males and females, S.2 inches; tail vertebras, 2.5 inches; 

 hind foot, i.i inches. Found in "Central and southeastern 

 Wyoming (north to Parkman, Sheridan County), and 

 eastern Colorado south to Colorado Springs." (Bailey) 



Sagebrush Pocket Gopher. — Thomomys talpoides bullatus 

 Bailey. 

 Brighter in color than typical talpoides but like it in size. 

 Upperparts like clusius but less gray on cheeks; underparts 

 buffy. Winter pelage paler above than summer, light buffy 

 gray, underparts creamy white. Total length, males, 9.6 

 inches, females, 9.0; tail vertebrae, males, 3.0 inches, females, 

 3.1; hind foot, males, 1.20 inches, females, 1.16. Found in 

 "Plains of eastern Montana, northeastern Wyoming, and 

 western South Dakota; north to Medicine Hat, Alberta." 

 (Bailey) 



Black Hills Pocket Gopher. — Thomomys talpoides nebulosus 

 Bailey. 

 Resembling typical talpoides in size but pelage with more 

 brownish gray. Upperparts (summer) dull brownish gray; 

 darker on nose and about ear, dusky or blackish ; feet gray- 

 ish to buffy; tail like feet; underparts buffy with more or 

 less white on chin and breast. Winter pelage dark buffy 

 gray above, light buffy below. Total length, males and 

 females, 9.2 inches; tail vertebrae, 2.6 inches; hind foot, 1.26 

 inches. Found in "Black Hills, S. Dak., and Bear Lodge 

 Mountains, Wyoming." (Bailey) 



Bighorn Pocket Gopher.^ — Thomomys talpoides caryi Bailey. 

 Resembling clusius, slightly smaller, more rufescent, less 

 gray. Upperparts (summer) warm grayish brown; nose 



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