188 PEROMYSCUS. 



Genl. Char. Like P. I. nebrascensis , 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. 

 Hist., n, 1890, p. 285, Desc. p. 287. 



americanus deserticola (Peromyscus) , Elliot, Syn. N. Am. Mamm., 



1901, p. 125. 

 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, 10. 



148. tornillo (Peromysctis) , 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. arizonce, 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 vertebrae, 90; hind foot, 

 23; ear, 12. 



149. gymnotis (Pcromyscus) , Thomas, Ann. Mag. Nat. Hist., 6th 



Ser., xiv, 1894, p. 365. 

 NAKED-EARED MOUSE. 



Type locality. Guatemala. 



Geogr. Distr. Guatemala, Central America. 



Genl. Char. Size medium; ears long, naked; tail shorter than 

 head and body. 



