VOL. XX, PP. 85-86 DECEMBER 11, 1907 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



V 



A COLORADO RECORD FOR CALLOSPERMOPHILUS 



WORTMANI, WITH NOTES ON THE RECENT 



CAPTURE OF ANTROZOUS PALLIDUS. 



BY MERRITT CARY. 



Additional work on the distribution of Colorado mammals, 

 carried on during the field season of 1907 by the Biological 

 Survey, shows that the pale bat (Antrozous pallidus) is a resi 

 dent of the low Upper Sonoran valleys in the extreme south 

 western part of the State. Although this species was taken once 

 in Colorado over thirty years ago, no subsequent notice of its 

 occurrence in the State has appeared, so its recent discovery 

 seems worthy of record. 



A critical examination of a small series of Callospermophilus 

 secured in northwestern Colorado in 1906 discloses the fact that 

 a specimen from the Snake River Valley is referable to C. wort- 

 mani, and it is placed on record at this time. 



Antrozous pallidus (Le Conte). 



Two female specimens of the large pale bat were collected at Ashbaugh's 

 Ranch, McElmo Canyon, Monteznma County, June 21, 1907. From my" 

 position at the base of the rocky walls of the canyon immediately north 

 of the ranch, numbers of these bats were seen in the gloaming, flying 

 about the upper rim rock in company with several smaller bats. The 

 specimens were shot with difficulty, as the majority of individuals flew so 

 high as to be out of range. The only previously recorded instance of the 

 capture of this bat within the State is that given by Coues and Yarrow* 

 of a Pueblo specimen taken many years ago and deposited in the U. S. 

 National Museum. Unfortunately, this specimen has been lost. 



* Expl. W. of lUOth Mer., V, p. ., 1875. 



19 PROC. BIOL. Soc. WASH., VOL. XX, 1907. (85) 



PEC 11 J 



