FIELD BOOK OF MAMMALS 



Cheyenne Pocket Mouse. — Perognathus flavus piperi Goldman. 

 Larger than typical flavus and with less intensely ochraceous 

 upperparts. Upperparts light buff to light ochraceous 

 buff, finely mixed with black, lateral line and spots at bases 

 of ears pale but distinct; tail whitish above and below; 

 underparts white. Total length, 4.6 inches; tail vertebrae, 

 2 inches; hind foot, .68 inch. Found "probably ranging at 

 low elevations throughout eastern Wyoming and western 

 South Dakota." (Goldman) 



Yavapai Pocket Mouse. — Perognathus flavus bimaculatus 

 (Merriam). 

 Resembling typical flavus but larger and somewhat darker 

 on back; lateral lines more distinct. Total length, 4.7 

 inches; tail vertebra, 2.1 inches; hind foot, .68 inch. Found 

 in "Central and northeastern Arizona and southeastern 

 Utah." (Osgood) 



Sooty Pocket Mouse. — Perognathus flavus fuliginosus (Mer- 

 riam). 

 Much darker than ty^xcaX flavus ; upperparts almost or quite 

 black except for buff spots back of ears; underparts buff, 

 throat and breast white. Total length, 4.6 inches; tail 

 vertebrae, 2.3 inches; hind foot, .72 inch. Found on "Lava 

 beds in the vicinity of San Francisco Mountain, Arizona." 

 (Osgood) 



Apache Pocket Mouse. — Perognathus apache apache Merriam. 

 Large in size, pelage soft, tail thinly haired, sole of hind foot 

 hairy on upper three-fifths. Upperparts warm buff 

 sprinkled with black; lateral line distinct; buff on ears and 

 upperside of tail ; underparts white. Total length, 5.6 inches; 

 tail vertebrae, 2.7 inches; hind foot, .74 inch. Found in 

 "Eastern Arizona, western New Mexico, and southern 

 Utah." (Osgood) 



Plateau Pocket Mouse. — Perognathus apache cleomophila 

 Goldman. 

 Differing from typical apache in darker and richer color of 

 upperparts. Upperparts ochraceous buff to tawny, mixed 

 with black-tipped hairs; ears blackish inside, conspicuous 

 white spots at bases of ears; feet white; lateral line clear 

 ochraceous buff; tail above, brownish, below white; under- 

 parts white. Total length, 5.6 inches; tail vertebrae, 2.6 

 inches; hind foot, .8 inch. Found in the "Lava beds region 

 east of San Francisco Mountain, Arizona." (Goldman) 



Colorado Pocket Mouse. — Perognathus apache caryi Goldman. 

 Larger and darker than typical apache. Upperparts light 

 ochraceous buff heavily mixed with black; ears as in cleo- 

 mophila; lateral line broad and well defined, light ochraceous 

 buff; tail above, grayish to brownish, below, white; under- 

 parts white. Total length, 6 inches; tail vertebrae, 2.9 

 inches; hind foot, .8 inch. Found in "Valleys of Grand 

 River and other affluents of the Colorado River in western 

 and southwestern Colorado." (Goldman). 



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