362 PEROGNATHUS. 
Measurements. Total length, 210; tail vertebrae, 122; hind foot, 
27. Skull: occipito-nasal length, 30; Hensel, 21.5; greatest mastoid 
breadth, 15.6; length of interparietal, 4.2; greatest width of inter- 
parietal, 6.8; interorbital constriction, 6.8; length of nasals, 12.2. 
a.—rhydinorhis (Perognathus), Elliot, Pub. Field Columb. Mus., 
III, 1903, p. 167. Zodlogy. 
SAN QUENTIN PocKeET Mouse. 
Type locality. San Quentin, Lower California, Mexico. 
Geogr. Distr. West coast of Lower California in the vicinity of 
San Quentin. 
Genl. Char. Similar to P. baileyi, but darker, with very slender 
nasals, larger mastoids, and more slender upper incisors. 
Color. Upper parts and sides pale buff, finely lined with black, 
darkest on head; sides of head, the nose, cheeks, and line above eyes 
yellowish buff, lined with black; ochraceous lateral line from lips to 
thighs; under parts pure white; tail above and pencil dark brown, 
beneath yellowish white; hands and feet grayish white. 
Measurements. Total length, 232; tail vertebra, 128; hind foot, 
27; ear, 11.5. Skull: occipito-nasal length, 31; Hensel, 22; zygo- 
matic width, 16; interorbital constriction, 6.5; width of interparietal, 
6.5; length of nasals, 10; palatal length, 12; mastoid breadth, 15; 
length of upper tooth row, 4. 
366. cnecus (Perognathus), Elliot, Pub. Field Columb. Mus., 111, 
1903, p. 169. Zodlogy. 
BuFF-COLORED Pocket MOusE. 
Type locality. Rosarito, San Pedro Martir Mountains, Lower 
California, Mexico. 
Genl. Char. Size very large; color of under parts deep cream 
buff; skull large, with very long, slender nasals, broadening at tip. 
Color. Upper parts ochraceous buff, lined with black; top of 
nose and whiskers blackish; spot in front of eye, and broad lateral 
band from lip to posterior part of thigh ochraceous buff; sides above 
lateral line grayish buff; rest of under parts, arms, legs, hands, and 
thighs creamy buff, and a pure white spot with hairs white to the 
roots on chest between arms, extending in a narrow line towards 
abdomen; tail hairy, above blackish, beneath cream buff; ears dark 
brown. 
Measurements. Total length, 228; tail vertebra, 126; hind foot, 
28; ear, 9.5. Skull: occipito-nasal length, 32; Hensel, 22; zygomatic 
width, 16.5; greatest mastoid breadth, 16; greatest width of inter- 
parietal, 8; interorbital constriction, 7; median length of nasals, 13; 
lateral length, 14; posterior width of nasals, 2; anterior width, 3; 
