284 THOMOMYS. 



704. Thomomys clusius Coues. 



Thomomys clusius Coues, Proc. Aca.d. Nat. Scien. Phil., 1875, 

 p. 138. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, 

 p. 229. Zool. Ser. 

 Coues' Pocket Gopher. 



Type locality. Bridger Pass, Sweetwater County, Wyoming. 

 Geogr. Distr. Uncompahgre Reservation, Utah, through south- 

 western Wyoming into southern and central Idaho. 



a. Tlioinoinys chisius ociiis Merriam. 



Thomomys clusius ocius Merr., Proc. Biol. Soc. Wash., xiv, 1901, 

 p. 114. 

 Swift Pocket Gopher. 



Type locality. Fort Bridger, Uinta County, Wyoming. 



Geogr. Distr. Wyoming. Range unknown. 



Genl. Char. Similar to T. clusius; interparietal and bullae larger. 



Color. Above pale buffy; cheeks pale buffy gray; sides buffy 

 white; under parts and feet white. 



Measurements. Total length, 204 ; tail vertebrae, 197 ; hind foot, 25. 



705. Thomomys idahoensis Merriam. 



Thomomys idahoensis Merr., Proc. Biol. Soc. Wash., xiv, 1901 , p. 1 14. 

 Idaho Pocket Gopher. 



Type locality. Birch Creek, Fremont County, Idaho. 



Geogr. Distr. Idaho. Range unknown. 



Genl. Char. Size small; similar to T. clusius. Skull: bullae large; 

 zygomata narrow; nasals long, slender. 



Color. Above grayish buff washed with buffy fulvous; under 

 parts, tail, and feet buffy white. 



Measurements. Total length, 179 ; tail vertebrae, 47 ; hind foot, 23. 



706. Thomomys pygmaeus Merriam. 



Thomomys pygmoeus Merr., Proc. Biol. Soc. Wash., xiv, 1901, 

 p. 115. 

 Pygmy Pocket Gopher. 



Type locality. Montpelier Creek, Bear County, Idaho. Altitude, 

 6,700 feet. 



Geogr. Distr. Idaho. Range unknown. 



Genl. Char. Size small. Skull similar to T. idahoensis, smaller; 

 interparietal transversely oval; nasals short, emarginate posteriorly; 

 bullae small. 



Color. Above dark rufous brown; beneath buify fulvous; feet 

 whitish. 



Measurements. Total length, 177 ; tail vertebrae, 46; hind foot, 22. 



