PEROGNATHUS. 365 
Color. Upper parts and sides hair brown; lateral line fawn; 
under parts soiled white; tail black above, whitish beneath; ears 
dusky. 
Measurements. Total length, 182; tail vertebra, 104; hind foot, 
23; ear, 8. Skull: occipito-nasal length, 26; Hensel, 18; greatest 
mastoid breadth, 13.8; length of parietal, 3.5; greatest width of 
interparietal, 7.6; interorbital constriction, 6.7; length of nasals, ro. 
a.—canescens (Perognathus), Merr., Proc. Acad. Nat. Scien. Phil., 
ms04, p. 267. 
JaRAL Pocket Mouse. 
Type locality. Jaral, State of Coahuila, Mexico. 
Geogr. Distr. Known only from type locality. 
Genl. Char. Similar to P. intermedius; larger and more grayish. 
Color. Upper parts drab gray; lateral line pinkish buff; under 
parts white; tail mouse gray above, white beneath. 
Measurements. Total length, 193; tail vertebre, 117; hind foot, 
22. Skull: occipito-nasal length, 25; Hensel, 17.5; greatest mastoid 
breadth, 13.5; length of interparietal, 37; greatest width of inter- 
parietal, 7.2; interorbital constriction, 6.1; length of nasals, 9.3. 
371. goldmani (Perognathus), Osgood, N. Am. Faun., No. 18, 1900, 
Pp. 54. 
GOLDMAN’s Pocket MOUSE. 
Type locality. Sinaloa, State of Sinaloa, Mexico. 
Geogr. Distr. States of Sonora and Sinaloa, Mexico; coast 
plains. 
Genl. Char. Size large; ears large; similar in color to P. nelsoni. 
Color. Upper parts broccoli brown, darkened on anterior half 
with black; lateral line pinkish buff; ear whitish exteriorly for 
apical half; under parts white; tail blackish above, white below. 
Measurements. Total length, 202; tail vertebra, 108; hind foot, 
28. Skull: occipito-nasal length, 27.7; Hensel, 20.6; greatest mas- 
toid width, 14.3; length of interparietal, 3.8; greatest width of inter- 
parietal, 6.5; interorbital constriction, 6.5; length of nasals, 11.1. 
a.—artus (Perognathus), Osgood, N. Am. Faun., No. 18, r1g00, 
Pp. 55: 
Batopitas Pocket Mouse. 
Type locality. Batopilas, State of Chihuahua, Mexico. 
Geogr. Distr. States of Chihuahua, Durango, and Sinaloa, 
Mexico. 
Genl. Char. Similar to P. goldmani; rump bristles undeveloped; 
slight cranial differences. 
