MAMMALS OF THE MEXICAN BOUNDAEY. 



307 



9, 1894. They were subsequently taken in the Tule, Granite, and Gila 

 mountains. As we traveled north from Tinajas Altas, east of the 

 Gila Mountains, it was last noted on the plain midway between Tinajas 

 Altas and Adonde, on the Gila River, and was not again seen until wo 

 reached Gila City on the Gila River at the northern extremity of the 

 Gila Mountains. None were observed on the lower course of the 

 Colorado River. 



During February, 1894, the rock-squirrel was found in abund- 

 ance in the vicinity of Tinajas Altas, numbers having been attracted 

 to the locality from the surrounding country bj' the grain spilled 

 by the draft animals of the Survey. A single trap, conspicuously 

 placed on a rock near mv tent, kept me fully occupied with skinning 



a b 



Fig. 48.— Ammospermophilus haeeisii saxicola. (Type, Cat. no, 

 VIEW; b, Ventral view; c. Lateral view. 



U.S.N.M.) a, Dorsal 



specimens of it which were caught. In the Granite Mountains its 

 capacious cheek-pouches were usually distended with mesquite seeds. 

 Three females, taken February 16 to 19, 1894, each contained 6 large 

 fetuses, showing that the young are born with some uniformity late 

 in Februarj'^, as no young were seen up to that season. 



Measurements of 5S specimens of the Ammospermophilvs harrisii group. 



