358 PEROGNATHUS. 



PAGE 



g." Above grayish fawn P. anthonyi 366 



h." Above grayish yellowish brown and 



black P. jemoralis 367 



i." Above mixed pale gray, light buff, and 



black P. /. mesopolius 367 



penicillatus aremtrius (Perognathus} , Merr., Proc. Cal. Acad. Scien., 



2d Ser., iv, 1894, p. 461. 

 LITTLE DESERT 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. penicillatus. 



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 vertebrae, 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 angustirostris (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 premaxillae 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 vertebras, 105; 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., 1901, p. 253. 



obscurus Allen, Bull. Am. Mus. Nat. Hist., 1895, P- 2I ^- 

 PRICE'S POCKET MOUSE. 



Type locality. Oposura, State of Sonora, Mexico. 



