30 Goldman — Twelve New Wood Rats. 



parts dull white, the deep plumbeous basal color showing through every- 

 where except on a small pectoral area where the fur is pure w.hite; tail 

 indistinctly bicolor (nearly concolor toward tip), smok}' brown above, 

 slightly paler and grayer below. 



Cranial characters. — General outline of skull siniilai' to that of N. Irncn- 

 don; n^als more wedge-stiaped, pointed posteriorly, with a narrow emar- 

 gination between the ends; palate decidedly shorter than incisive fora- 

 mina (in leucodon about equal), and with a short postei'ior median projec- 

 tion (absent in leucodon) ; ascending branches of premaxillse very long, Hie 

 ends reaching posteriorly beyond nasals in approaching parallel lines to 

 interorbital constriction. 



Measurements. — Type : Total length, 335; tail vertebra, 145; hind foot, 37- 



Neotoma leucodon zacatecae subsp. nov. 



Tt/pe from Plateado, Zacatecas, Mexico (altitude, 7600 feet). Adult female 

 No. 90,957, U. S. National Museum, Biological Survey Collection. Septem- 

 ber 4, 1897. E. W.Nelson and E. A. Goldman, Original number 11,641. 



General characters. — Similar to N. leucodon, but color decided!}^ darker ; 

 upper lip dusky instead of grayish or whitish ; skull more arched and 

 otherwise peculiar. 



Color. — Upperparts pale cinnamon, lightest on cheeks and along sides, 

 becoming redder on rump, well darkened along median dorsal area by 

 black-tipped hairs; chest and inguinal region pure white; belly dull 

 creamy white; upper lip dusky; feet white; tail well haired, sharply 

 bicolor, brownish black above, white below. 



Cranial cJiarncters. — Skull similar to that of N. leucodon, but more arched 

 across anterior roots of zygomata ; rostrum moredecurved ; frontals longer; 

 maxillary arm of zygoma heavier; upper incisors smaller. 



Measurements. — Type: Total length, 358; tail vertebrae, 1()2; hindfoot,37. 



Neotoma ferruginea ochracea subsp. nov. 



Type from Atemajac, near Guadalajara, Jalisco, Mexico (altitude, 4000 

 feet). Nearly adult male. No. |Hf I- U. S. National Museum, Biological Sur- 

 vey Collection. May 21, 1892. E. \V. Nelson. Original number 2653. 



General characters. — Size smaller than N. ferruginea; coloration pale; 

 feet pure white; tail sharply bicolor; skull small, light and elongated. 



Color. — Entire upperparts light ochraceous buff, purest and brightest 

 along cheeks and sides, darkened over dorsal region, especially on poste- 

 rior half, by black-tipped hairs; underparts dingy white, washed with 

 buffy, becoming clear, strong, ochraceous buff on pectoral region ; nose and 

 upper lip grayish white; feet pure white; tail brownish above, whitish 

 below. 



Cranial characters. — Skull similar in general to that of N. ferruginea, but 

 smaller and more arched; nasals more slender, reaching posteriorly to 

 plane of lachrymals, tlie ends more pointed ; ascending branches of pre- 



