56 



noticed by Mr. Bennett on one of the spurs of Mt. Lincoln, while 

 here and there a weathered skull attested their former greater fre- 

 quency. 



iXIIIOCAFRIDi:. 



1.7. Aiitiflocapra Americana. Pronghorn. "Antelope." 

 Not uncommon in South Park. 



Cervio.e. 



18. Cervus Canadensis. Elk. Becoming rare ; formerly 

 common. In summer keeps near the upper limit of timber, descend- 

 ing occasionally into tbe valleys in winter. 



J.©. Cervus roiacrotis. Mule Deer. More or less common, 

 but in summer is said to be most frequent near the timber line, though 

 occurring more or less generally throughout the mountains. 



Vesfibtilioxidj;. 



2©. Xiasiwrus ? A small bat was a few times seen flying about 

 camp soon after sunset, which was probably Lasiurus Noveboracensis. 



MUIIEI>JE. 



551. HJeotoma cinei'CUS. Wood Eat. Common. It freely 

 enters houses and storerooms in quest of food, and is sometimes ex- 

 tremely troublesome. 



22. Hesperomys fleucopiis, var. sonoriensis (Coues 

 Ms.). White-footed Mouse. A species of Hesperomys, probably II. 

 leucopus, var. sonoriensis is quite common. 



23. Arvicola ? Field Mouse. An undetermined species 



of short-tailed field mouse, undoubtedly an Arvicola, is said to be 

 more or less frequent. 



2-4. Fiber zibetliicus. Muskrat. More or less common at 

 favorable localities. 



GlOKTIDJI. 



2;>. Tliomoniys i'iifescen§. Fort Union Gopher. Com- 

 mon almost everywhere, in moderately dry soil. Observed their 

 burrows on the Snowy Range, nearly up to the limit of vegetation. 



CAST01tI»JE. 



2©. Castor fiber. Beaver. Quite common on the South 

 Platte and its tributaries. Saw their last dam on the Platte a few 

 miles below Montgomery, above which point they are said not to 

 occur. 



