188 PEROMYSCUS. 
Genl. Char. Like P. 1. nebrascensts, tail slightly haired. 
Color. Upper parts dull buffy, darker on dorsal line, lighter on 
sides; tail brown above, white below. (O. Thomas in litt., ex Type.) 
Measurements. Total length, 167; tail, 76; hind foot, 22; ear, 20. 
Skull: basilar length, 19.5; greatest breadth, 13; length of nasals, 9.5; 
length of upper molar series, 3.7. 
e.—deserticola. 
leucopus deserticola (Hesperomys), Mearns, Bull. Am. Mus. Nat. 
EUISt 3t, 1890, ps 285) Desc. pa 267. 
americanus deserticola (Peromyscus), Elliot, Syn. N. Am. Mamm., 
TOOL Pa L215: 
Desert WHITE-FOOTED MOUSE. 
Type locality. Mojave Desert, San Bernardino County, California. 
Geogr. Distr. Lower California and State of Sonora, Mexico, and 
desert regions of California and Arizona. 
Genl. Char. Ears medium; tail long; pelage short. 
Color. Above pale cinereous drab, slightly darker on median 
line, light fulvous on sides and rump; tail narrowly striped above 
with dark brown. 
Measurements. Total length, 168; tail, 78.7; hind foot, 20.8. 
Skull: occipito-nasal length, 25.5; Hensel, 20; zygomatic width, 12.5; 
interorbital constriction, 4; length of nasals, 5.5; palatal length, ro. 
148. tornillo (Peromyscus), Mearns, Proc. U. S. Nat. Mus., 1896, p. 
445. Elliot, Syn. N. Am. Mamm., 1901, p. 126. 
Rio GRANDE WHITE-FOOTED MOUSE. 
Type locality. Rio Grande, six miles above El Paso, El Paso 
County, Texas. 
Geogr. Distr. State of Chihuahua, north into Texas and New Mexico. 
Genl. Char. Similar to P. t. arizone, but paler, ears smaller, body 
stouter. (Mearns, 1. c.) 
Color. Above light broccoli brown; feet and under parts pure 
white; tail bicolor. 
Measurements. Total length, 192; tail vertebre, 90; hind foot, 
23 -UCAty 12. 
149. gymnotis (Peromyscus), Thomas, Ann. Mag. Nat. Hist., 6th 
Sek, Mie DGOA. pesos 
NAKED-EARED Mouse. 
Type locality. Guatemala. 
Geogr. Distr. Guatemala, Central America. 
Genl. Char. Size medium; ears long, naked; tail shorter than 
head and body. 
