57 



SC IUIIIIKK. 



97. Sciurus Hudsonius, var. Fremont i. Fremont's 

 Squirrel. Not abundant. 



98. Tamias lateralis. Say's Striped Squirrel. Common. 

 Ranges up to timber line. 



2O. Xamias quadrivHtatiis. Missouri Striped Squirrel. 

 Abundant from about seven thousand feet up to the extreme limit of 

 vegetation. 



30. Spcrniopliilus tridecem-lineatiis. Striped Prai- 

 rie Squirrel. Everywhere common, especially in South Park. 



31. Cynomys G uuiiisoiii. Gunnison's Prairie Dog. Com- 

 mon in South Park, and thence eastward to the plains, where it is 

 immediately replaced by Cynomys Ludovicianus. 



39. Arctomys flaviventer. Yellow-footed Marmot. Abun- 

 dant about Montgomery, ranging from the valley of the Platte up to 

 the limit of vegetation. Most numerous at and above the timber-line, 

 where often quite a number were visible at the same moment, basking 

 on the rocks. Specimens entirely black are of frequent occurrence. 

 Their sharp call, in character somewhat between a clear whistle and 

 a short, sharp bark, well entitle them to the name of "whistling 

 marmot." They seem to be almost restricted to the alpine district, 

 none being met with below ten thousand feet. 



II YSTI3IC fO.K. 



33. Eretliizoii dorsatus, var. epizaiitliu*. Porcu- 

 pine. Common, ranging from the foot-hills upward to the timber line. 



34. I, a 8*0111 js priii cops. Little Chief Hare. "Cony." 

 Very abundant on the Snowy Range about the sources of the Platte. 

 Are first met with but a few hundred feet below the timber line, rang- 

 ing thence upward to the limit of vegetation. Mr. Bennett observed 

 them on the top of Mt. Lincoln, and we often found them above 

 timber line, in places almost entirely destitute of vegetation. Their 

 favorite haunts are taluses, and are seen almost exclusively among 

 the bare loose rocks that cover so much of the higher slopes. They 

 are very unsuspicious, allowing a near approach. When seated among 

 the rocks, or when running about among them, they make known 

 their presence by the frequent utterance of their feeble call note, 

 which may sometimes be heard from a dozen individuals at once. 

 They were often very abundant where there was scarcely any vegeta- 



ESSEX INST. BULLETIN. vi 6 



