358 PEROGNATHUS. 
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oy Abowe etayisht tawils. een. 23 meen tae P. anthonyt 366 
h.’” Above grayish yellowish brown and 
Iplaeles 3 ue eek tng ean ete ee eee aoe P. femoralis 367 
i./’ Above mixed pale gray, light buff, and 
lol eVel Saree ene eae course eee NN, P. f. mesopolius 367 
penicillatus arenarius (Perognathus), Merr., Proc. Cal. Acad. Scien., 
ad Ser., 1V, 1894, p. 461. 
LittLE DrEsERT Pocket MOUSE. 
Type locality. San Jorge, near Comandu, Lower California, 
Mexico. 
Geogr. Distr. East coast of Lower California. 
Genl. Char. Size very small; tail exceeding head and body; no 
bristles. Similar to P. pentcillatus. 
Color. Above buffy drab, mixed with black; sides paler; no 
lateral line; white spot on lower margin of ears; under parts white; 
tail brownish above, white below. 
Measurements. Total length, 136; tail vertebre, 70; hind foot, 
20. Skull: length of Hensel, 15.3; occipito-nasal length, 23; greatest 
mastoid breadth, 12; length of interparietal, 3.5; greatest width of 
interparietal, 6.4; interorbital constriction, 6.2; length of nasals, 8.8. 
penicillatus angsustirostris (Perognathus), Osgood, N. Am. Faun., 
No. 18, 1900, p. 47. Elliot, Syn. N. Am. Mamm., 1901, p. 252. 
SLENDER-NOSED Pocket Mouse. 
Type locality. Carriso Creek, Colorado Desert, San Diego 
County, California. 
Geogr. Distr. Northern Lower California, east to the Colorado 
Desert and southwestern Arizona, north to Colorado Desert, California. 
Genl. Char. Similar to P. penicillatus, but smaller; nasals and 
ascending premaxille long and narrow. 
Color. Above vinaceous buff, sprinkled with black; under parts, 
fore legs, and feet white; lateral stripe indistinct, pale fulvous; tail 
above dusky extending over pencil, beneath white. 
Measurements. Total length, 191; tail vertebrae, 1o5; hind foot, 
24.4. Skull: length of Hensel, 18; occipito-nasal length, 26; greatest 
mastoid breadth, 13; length of interparietal, 3.1; greatest width of 
interparietal, 7; interorbital constriction, 6.4; length of nasals, 10.3. 
penicillatus pricii (Perognathus), Allen, Bull. Am. Mus. Nat. Hist., 
1894, p. 318. Elliot, Syn. N. Am. Mamm., rgot, p. 253. 
obscurus Allen, Bull. Am. Mus. Nat. Hist., 1895, p. 216. 
Price’s Pocket Mouse. 
Type locality. Oposura, State of Sonora, Mexico. 
