Goldman — Five New Mammals from Arizona and Colorado. 23 



cal Survey Collection); collected by E. A. Goldman, November 23, 1913. 

 Original number 22309. 



Geographic distribution. — Desert mountains of extreme southwestern 

 Arizona, and doubtless adjacent parts of Sonora, Mexico. 



General characters. — Similar in general to Perognathus intermedins in- 

 termedins, but smaller and decidedly paler, the upperparts a lighter buff 

 less densely mixed with black. 



Color. — Type : Upperparts between light buff and pale ochraceous-buff 

 (Ridgway, 1912), purest on cheeks, sides, and across hips, the top of 

 head and back modi tied by rather thinly overlying dusky-tipped hairs; 

 underparts, limbs, and feet white; tail brownish above, white below, 

 except penciled tip which is brownish all around. 



Skull. — Like that of P. i. intermedins, but smaller. 



Measurements.— Type : Total length, 165; tail vertebrae, 97; hind foot, 

 20.5. Skull (type): Greatest length, 23; greatest mastoid breadth, 12.3; 

 interorbital breadth, 5.8; nasals, 8.5; interparietal, 6.1 x 2.6; maxillary 

 toothrow, 3.4. 



Remarks. — The discovery of this geographic race materially extends the 

 known range of Perognathus intermedins in southwestern Arizona. The 

 pallid coloration of the new form, paralleled by that of a congenor, Perog- 

 nathus pencillatus angustirostris, inhabiting the same region, is appar- 

 ently associated with light-colored soil conditions. Some of the other 

 small mammals living in the restricted area appear to have yielded to 

 similar environmental influences. 



Specimens examined. — Three, all from southwestern Arizona, as follows: 



Tinajas Altas (type locality), 2; Tule Wells, 1. 



Perognathus apache cleomophila,* subsp. nov. 



PLATEAU POCKET MOUSE. 



Type from Winona, Coconino County, Arizona ( altitude 6,400 feet). No. 

 226344, & adult, U. S. National Museum (Biological Survey Collection). 

 Collected by E. A. Goldman, July 19, 1917. Original number 28127. 



Geographic distribution. — Lava beds region east of San Francisco Moun- 

 tain, Arizona. 



General characters. — Closely allied to Perognathus apache apache, but 

 upperparts much darker and richer in general coloration, the ochraceous 

 buffy element deeper or more intense, and more heavily overlaid with 

 black. Similar to P. a. melanotis, but larger and darker, with skull 

 differing in detail. 



Color.— Type : Upperparts near ochraceous-buff (Ridgway, 1912) but 

 slightly more tawny, this color pure along broad lateral line, but much 

 obscured on head and back by overlying black-tipped hairs ; underparts, 

 fore limbs, and feet white; ears blackish inside ; subauricular white spots 

 conspicuous; tail brownish above, white below. In some specimens an 



• From Cleome serrulata, the seeds of which are extensively gathered by this pocket 

 mouse. 



