VOL. XX, PP. 23-28 MARCH 27, 1907 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SOME UNRECORDED COLORADO MAMMALS. 

 BY MERRITT GARY. 



Fifteen species of mammals collected in the course of ex 

 plorations conducted by the Biological Survey in Colorado have 

 not been hitherto recorded from that State, and authentic evi 

 dence of the occurrence of two additional species has also been 

 obtained for the first time. Most of these additions to the Colo 

 rado mammal list were made in the field seasons of 1905-06, 

 during which a detailed survey was made of the region north of 

 Grand River, extending from the plains at the eastern base of 

 the foothills in Jefferson, Boulder, and Larimer counties, west 

 ward to the Utah line. The additions are briefly recorded in the 

 present paper, together with notes on the ranges of three other 

 little-known Colorado mammals, pending a complete report when 

 a thorough survey of the distribution areas of the State shall 

 have been completed. 



For the privilege of publishing the following records, all but 

 two of which are based on specimens in the collection of the 

 Biological Survey, my thanks are due Dr. C. Hart Merriam. 



Sciurus aberti mitnus Merriam. 



Vernon Bailey reports this handsome squirrel as common in the eastern 

 foothills of the San Juan Mountains, 10 miles west of Antonito,' Conejos 

 County, where it inhabits the yellow pine forests. 



Eutamias dorsalis utahensis Merriam. 



Early in September, 1906, fifteen specimens of this beautiful gray chip 

 munk were collected in the dense cedar and pinon breaks near Douglas 

 Spring, at the north base of the Escalante Hills, in western Routt County. 

 A few were taken among the yellow pines as high as 7,000 feet, but they 

 were most abundant on the north slopes of the Escalantes, at about 6,400 

 feet. 



This chipmunk was described from Ogden, Utah, and has not been 

 taken previously much east of Provo, in tohat State. It is largely an Upper 

 4 PROC. BIOL. Soc. WASH., VOL. XX, 1907. (23) 



