182 PEROMYSCUS. 
americanus sonoriensis (Peromyscus), Elliot, Syn. N. Am. Mamm., 
LOOL~ pete 52 
SONORA WHITE-FOOTED FIELD MOUSE. 
Type locality. Santa Cruz, State of Sonora, Mexico, boundary 
line Mexico and United States. 
FiG. XXXVII. PEROMYSCUS L. SONORIENSIS. 
SONORA WHITE-FOOTED FIELD MOUSE. 
Geogr. Distr. From Zapotlan, Sierra Nevada de Colima, State of 
Jalisco, north to British Columbia west of Rocky Mountains. 
Genl. Char. Medium size; tail short; color pale. 
Color. Above dark cinereous, mixed with brownish gray; under 
parts whitish; feet brownish white; tail above dark brown, beneath 
paler. 
Measurements. Total length, 166; tail vertebre, 69; hind foot, 
21.5; ear, 20. Skull: occipito-nasal length, 24; Hensel, 18; zygo- 
matic width, 11.5; interorbital constriction, 4; palatal length, 10; 
length of nasals, 10; length of upper tooth row, 3. 
leweopus blandus. 
sonoriensis blandus (Peromyscus), Osgood, Proc. Biol. Soc. Wash., 
XVil, 1964, p50. 
GENTLE Mouse. 
Type locality. Escalon, State of Chihuahua, Mexico. 
Genl. Char. Similar to P. 1. sonoriensis, but smaller; tail shorter. 
Color. Upper parts vinaceous buff sprinkled with dusky; lateral 
line vinaceous buff; under parts creamy white; hands and feet white; 
ankles with traces of dusky or buffy; ears whitish. 
Measurements. Total length, 145; tail vertebre, 61; hind foot, 
21. Skull: greatest length, 25.4; Hensel, 19.7; zygomatic width, 
12.5; interorbital constriction, 4; interparietal, 8x1.9; length of nasals, 
