FIELD BOOK OF MAMMALS 



white. Total length, 9.6 inches; tail vertebras, 4.4 inches; 

 hind foot, i.i inches. Found in Cleveland County, Okla- 

 homa; limits of range unknown. 



Penicillatus Group 



Desert Pocket Mouse. — Perognathus penicillatus penicillatus 

 Woodhouse. 

 Size large; tail long, crested, tufted; sole of hind foot naked 

 to heel; pelage somewhat soft, no spines on rump; markings 

 reduced, color uniform. Upperparts vinaceous buff sprink- 

 led with black; sides like back, no lateral line; no conspicu- 

 ous markings on face or head; tail above, dusky, below, 

 white to tuft; underparts white. Total length, 8.2 inches; 

 tail vertebras, 4.4 inches; hind foot, i.o inches. Found in 

 "Vicinity of Colorado River from Bunkerville, Nevada to 

 Yuma, Arizona, . . . Lower Sonoran Zone. " (Osgood) 



California Desert Pocket Mouse. — Perognathus penicillatus 

 angustirostris Osgood. 

 Colored like typical penicillatus but smaller. Total length, 

 7.3 inches; tail vertebrae, 4.1 inches; hind foot, .96 inch. 

 Found in "Colorado Desert; south to northern Lower Cali-" 

 fornia and east to the Colorado River and southwestern 

 Arizona, where it meets the range of penicillatus and pricei. 

 Lower Sonoran Zone." (Osgood) 



Price Pocket Mouse. — Perognathus penicillatus pricei (Allen). 

 Resembling typical penicillatus but smaller, pelage harsher, 

 more black on upperparts. Total length, 6.9 inches; tail 

 vertebrae, 3.7 inches; hind foot, .9^inch. Found in "South 

 central Arizona and Northwestern Mexico, west of the 

 wSierra Tvladre." (Osgood) 



Eastern Desert Pocket Mouse. — Perognathus penicillatus ere- 

 micus (Mearns). 

 Similar to pricei but paler and with softer pelage. Upper- 

 parts fawn, lightly sprinkled with black; faint spot at base 

 of whiskers; prominent dark area below ears. Total 

 length, 6.5 inches; tail vertebrae, 3.3 inches; hind foot, .88 

 inch. Found in "Extreme western Texas, thence south 

 into north central Mexico east of the Sierra Madre at least 

 to La Ventura, Coahuila." (Osgood) 



Stephens Pocket Mouse. — Perognathus stephensi Merriam. 

 Resembling penicillatus but very much smaller, very little 

 black in pelage. Upperparts uniform pinkish to vinaceous 

 buff; underparts white. Total length, 7. i inches; tail verte- 

 brcE,'3.8 inches; hind foot, .84 inch. Found in"Mesquite 

 Valley, northwest arm of Death Valley, Inyo County, Cal." 

 (Osgood) 



Intermedius Group 



Intermediate Pocket^Mouse. — Perognathus intermedius inter- 

 medins Merriam. 

 Size medium; color dark; markings well defined; weak spmes 



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