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 white ; tail 

 indistinctly bicolor (nearly concolor toward tip), smoky brown above, 

 slightly paler and grayer below. 



Cranial characters. General outline of skull similar to that of N. leuco- 

 don; nasals more wedge-shaped, 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 posterior median projec 

 tion (absent in leucodon} ; ascending branches of premaxillse very long, the 

 ends reaching posteriorly beyond nasals in approaching parallel lines to 

 interorbital constriction. 



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



Neotoma leucodon zacatecae subsp. nov. 



Type 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 1 1,641. 



General characters.- Similar to N. leucodon, but color decidedly 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 characters. Skull similar to that of N. leucodon, but more arched 

 across anterior roots of zygomata ; rostrum more decurved ; frontals longer ; 

 maxillary arm of zygoma heavier; upper incisors smaller. 



Measurements. Type: Total length, 358 ; tail vertebra, 162; hindfoot,37. 



Neotoma ferruginea ochracea subsp. nov. 



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

 feet). Nearly adult male, No. ftlff , U. S. National Museum, Biological Sur 

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



General characters. Size smaller than N. forrwimea ; 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 Blender, reaching posteriorly to 

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



