POCKET MOUSE 



on rump. Upperparts drab mixed with black; sides paler 

 than back; narrow lateral line, pale fawn; dusky on ears 

 and upperside of tail; tail blackish at tip, white on under- 

 side, buffy on sides; underparts white with faint buffy wash. 

 Total length, 7.2 inches; tail vertebrse, 4.1 inches; hind foot, 

 .90 inch. Found in "several scattered localities in the 

 Sonoran Zone of Arizona, New Mexico, and northern 

 Mexico." (Osgood) 



Gila Pocket Mouse. — Perognathus intermedins phasma 

 Goldman. 

 Smaller and decidedly paler than typical intermedins. 

 Upperparts light buff to pale ochraceous buff thinly mixed 

 with black on top of head and back, less black on cheeks, 

 sides, and hips: tail above, brownish, below white, pencil 

 brownish above and below; underparts white. Total 

 length, 6.6 inches; tail vertebras, 3.9 inches; hind foot, .82 

 inch. Found in "Desert mountains of extreme southwest- 

 ern Arizona and doubtless adjacent parts of Sonora, 

 Mexico." (Goldman) 



Short-eared ^California Pocket Mouse. — Perognathus fallax 

 fallax Merriam. 

 Slightly larger than typical intermedins, darker; rump 

 spines heavier. Upperparts bister mixed with black ; lateral 

 line pinkish buff; ears of medium size; tail bicolor; under- 

 parts creamy white. Total length, 7.7 inches; tail verte- 

 brae, 4.2 inches; hind foot, .92 inch. Found in "Extreme 

 southwestern California, occupying the region west of the 

 San Bernardino and San Jacinto ranges and extending south 

 into northern Lower California." (Osgood) 



Pallid Pocket Mouse; Pallid Short-eared Pocket Mouse. — 

 Perognathus fallax pallidus Mearns. 

 Very close to typical fallax in size but paler above ; pelage 

 of upperparts light gray at base instead of dark gray ; upper- 

 parts with less mixture of black, lateral line pale pinkish 

 buff; upperside of tail drab; underparts creamy white. 

 Total length, 7.8 inches; tail vertebrae, 4.3 inches; hind 

 foot, .96 inch. Found in California in the Lower Sonoran 

 Zone on the "east slope of main mountain divides in San 

 Diego, Riverside, and San Bernardino Counties." (Grin- 

 nell) 



Califomicus Group 



Great California Pocket Mouse. — Perognathus femoralis 

 fern oralis Allen. 

 Size very large; tail long, crested, tufted; ears large and 

 elongate; pelage harsh, spines on rump and flanks; color 

 dark. Upperparts bister, heavily mixed with intense black ; 

 rich buffy lateral line; tail bicolor; underparts soiled whitish, 

 with or without buffy suffusion. Total length, 9,0 inches; 

 tail vertebras, 5.0 inches; hind foot, i.i inches. Found 

 in "a few localities in San Diego County, in extreme south- 



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