MAMMALS OF UTAH 83 



GREEN RIVER POCKET GOPHER: 

 SWIFT POCKET GOPHER 



THOMOMYS OCIUS (Merriam) 



Thomomys calusius ocius Merriam, Proc. Biol. Soc. Wash. XIV, 

 114, July 19, 1901. 



Description — Summer pelage : Upper parts light buf fy 

 gray, more strongly buffy or tinged with brownish on crown 

 and back; sides clear gray; cheeks darker gray; ear patch 

 blackish but small ; under parts, feet, and tail soiled whitish 

 or creamy. Winter pelage: Upper parts lighter buffy 

 gray ; nose and cheeks clearer gray ; under parts whitish or 

 creamy. (Bailey.) 



Distribution — Green River Basin of southwestern Wyo- 

 ming, northwestern Colorado and northeastern Utah. Speci- 

 mens have been taken in Utah on the Uncompahgre Indian 

 reservation. 



This species prefers the sagebrush mesas along the 

 Green River. 



UINTA POCKET GOPHER 



THOMOMYS UINTA (Merriam) 



Thomomys uinta Merriam, Proc. Biol. Soc. Wash. XIV, 112, 

 July 19, 1901. 



Description — Summer pelage: Upper parts dull dark 

 brown, with dusky nose and face and blackish ear and ear 

 patch; under parts buffy or ochraceous, with occasionally 

 a white patch on chin ; feet and tip of tail usually whitish. 

 Late fall and winter pelage: Duller and more grayish. 

 Young, paler, more buffy than adults. (Bailey.) 



Distribution — Western Wyoming, southeastern Idaho, 

 and northern Utah. The Utah specimens have come from 

 Kelton, Ogden, Park City, Parley's canyon and the Uinta 

 mountains. (9,000-10,000 feet.) 



Habits — This species lives in the same mountain dis- 

 tricts and has quite the same environment as the Colorado 

 Pocket Gopher. 



