166 CALIFORNIA MAMMALS. 



part of Modoc County, California, and Mono Lake. I have one 

 that I caught at Mono Lake in a sandy flat. While this is a wide- 

 spread subspecies it does not seenn to be very common anywhere. 

 It seems to be an inhabitant of valleys and plains. 



Perognathus parvus magruderensis Osgood. (Of 



Mount Magruder.) 



MOUNT MAGRUDER POCKET-MOUSE. 



Very similar to olivaceous; larger ; skull larger and heavier ; 

 interparietal relatively narrower. 



Length about 192 mm. (7.60 inches); tail vertebrae 102 

 (4); hind foot 24 (.95). 



Type locality, Mount Magruder, Nevada, at 8,000 feet al- 

 titude ; higher parts of the motmtain ranges of the desert region 

 of eastern California and Nevada, grading into olivaceous at 

 their bases. 



Perognathus alticola Riioads. (A dweller on the 



heights. ) 



WHITE-EARED POCKET-MOUSE. 



Above ochraceous buff thickly mixed with black; sides 

 scarcely lighter than back; lateral buff line narrow and indistinct; 

 black crescent at base of whiskers obsolete; ears and tail white; 

 skull very similar to that of olivaceous. 



Length about 165 mm. (6.50 inches) ; tail vertebras 84 

 (3.30); hind foot 22 (.87). 



Type locality, Squirrel Inn, San Bernardino Mts., Califor- 

 nia. 



The half dozen known examples of the White-eared Pocket- 

 Mouse have been taken in a small area in the mountains north of 

 the town of San Bernardino, in open pine forest at 5,000 feet 

 altitude or a little higher. They are not common or more would 

 have been found with the amount of trapping that has been done 



