290 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



afford it a wider field for the development and exhibition of its 

 scansorial powers. 



I found it along the line of the Colorado from Peach Springs 

 and Diamond Creek to near the mouth of Cataract Creek. It was 

 abundant in the deep can^'on of the latter stream, where I obtained 

 specimens at the Havasupai Indian settlement, at the altitude of 

 8.000 feet, and found it thence for a distance of 30 miles up the 

 can3^on. 



In the pine region around AVhipple Ban-acks it is exceedingly 

 abundant. I found it at the highest points in that neighborhood, 

 Avhere the Arizona mountain chipnnnik {Entdni'Hts chiercicollis) 

 does not occur. Thence it follows the course of the streams and 

 canyons, always avoiding the smooth country, into the Agua Fria 

 Valley on one side and the Verde on the other. I traced it down 



Fl(i. 47.— EiTA.MlAS DORSAUS. (Cat. No. 37U38, U. S. N. M.) a, Doksaj. view; /), Vkntkal view; c. 



Lateral view. 



the Agua Fria and its branches to a point below New River and 

 down the Verde Kiver nearly to Salt River and the Gila. It range; 

 along the tributaries of the Verde River well up into the foothills 

 and along the high mesas of the Mogollon Mountains, reaching the 

 altitude of 0,500 feet; and to the southward it ranges to the pine- 

 clad summits of the Mazatzal Mountains. I also found it in the 

 valleys of Salt River and the Gila, and among the rocky foot- 

 hills bordering the Santa Cruz and Rio San Pedro, in southern 

 xVrizona. During a brief visit I failed to find it in the foothills 

 of the Chiricahua Mountains, but it probably ranges through those 

 mountains as it enters the Mexican State of Sonora. We were unable 

 t;) find it in the San Jose or Huachuca Mountains or in the ranges 

 to the westward. 



The Gila chipmunk was originally described by Spencer F. Baird 

 from specimens procured by J. H. Clark in the canyon i of the 



