172 CALIFORNIA MAMMALS. 



mountain slopes, but are easily distinguished from the latter 

 species in the flesh. The animals found in the type locality of 

 fallax are considerably paler than the usual run of fallax, and 

 are really intermediate between normal fallax and paUidus. 



Perognathus californicus Me:rriam. 



CALIFORNIA POCKET-MOUSE. 



Above yellowish bistre thickly mixed with black; spines of 

 rump and hips prominent; lateral stripe pale fulvous, distinct; 

 below yellowish white; tail long, crested-penicillate, sooty black 

 above, white beneath ; skull considerably arched ; mastoids small ; 

 occiput bulging posteriorly ; rostrum heavy ; outer sides of nasals 

 narrowed posteriorly; ears long, comparatively pointed. 



Length about 193 mm. (7.60 inches); tail vertebrae 103 

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



Type locality, Berkeley, California. 



Vicinity of San Francisco Bay, south to San Benito County. 



Perognathus californicus dispar Osgood. (Unequal.) 



ALLEN POCKET-MOUSE. 



Similar to calif ornicus but grayer and paler; grayer than 

 normal fallax ; skull heavier than typical californicus and in some 

 cases with larger mastoids, thus approaching femoralis. 



Length about 215 mm. (8.45 inches); tail vertebrae 120 

 (4.70) ; hind foot 27 (1.05) ; ear from crow^n 11 (.43). 



Type locality, Carpenteria, Santa Barbara County, Califor- 

 nia. 



Coast valleys of California from Los Angeles to San Benito 

 County, and the western foothills of the Sierra Nevada north to 

 Placer County. I have seen examples from the pine belt of the 

 San Bernardino Mountains that were very large, with skulls 

 that varied in the direction of femoralis. 



Perognathus femoralis Allen. (Of the thigh.) 



DARK POCKET-MOUSE. 



Similar to californicus; darker and rather larger; skull sim- 

 ilar to that of californicus. 



