Goldman Twelve New Wood Rats. 29 



Color. Type : Upperparts pale grayish buff, tinged with brownish along 

 cheeks and sides, the back slightly darkened by black-tipped hairs ; under- 

 parts white, the fur pale plumbeous basally along sides of belly ; ears gray 

 ish brown ; feet white; tail bicolor, brownish on upper third of circum 

 ference, dull whitish on lower two-thirds. 



Cranial ch arn cirr*. Skull similar to that of N. a.rvmiei, but bullse larger; 

 interpterygoid fossa narrower; maxillary arm of zygoma heavier; ant- 

 orbital foramina larger, the outer walls broader and projecting farther for 

 ward ; nasals truncate posteriorly, reaching plane of orbits; jugal rather 

 long; dentition of the albigula type, but rather light; supraorbital ridges 

 well developed and sharp as in N. arena cea. 



Measurements. Type: Total length, 330; tail vertebrae, 155; hind 

 foot, 40. 



Neotoma montezumae sp. nov. 



Type from Zimapan, Hidalgo, Mexico (altitude, 7500 feet). Adult male, 

 No. 81,426, U. S. National Museum, Biological Survey Collection. October 

 17, 1896. E. W. Nelson and E. A. Goldman. Original number 10,275. 



General characters. Size medium ; tail rather short, scantily haired, bi- 

 colored. Somewhat resembling N. a. melanura, but differing in darker 

 color, and in marked cranial characters. 



Color. Upperparts dull ochraceous buff, palest on head and along sides, 

 everywhere evenly and abundantly darkened by brownish or blackish 

 hairs ; underparts dull white, the under color of the fur plumbeous except 

 on throat, chest and inguinal region where it is pure white; nose, upper 

 sides of forearms and outer sides of hind legs, grayish brown ; ears brown 

 ish ; feet white; tail blackish above, whitish below. 



Cr'inial characters. Skull in general form similar to that of N. a. mela- 

 mm/,but larger and heavier; maxillary arm of zygoma decidedly heavier; 

 nasals narrower posteriorly; dentition much heavier; first upper molar 

 with antero-internal reentrant angle deeper, but not so deep as in N. 

 mexicana; bullse small as in N. a. melanura, but more pointed anteriorly. 



Measurements Type: Length (head and body), 181 ; tail vertebrae (in 

 complete), 91; hind foot, 39. 



Neotoma nelson! sp. nov. 



Tape from Perote, Vera Cruz, Mexico (altitude, 7800 feet). Adult female, 

 No. 54,320, U. S. National Museum, Biological Survey Collection. June 3, 

 1893.' E. W. Nelson. Original number 4935. 



General characters. Size large; tail stout, well haired, rather short; 

 coloration dark. Related to N. leucodon, but differing in darker color, and 

 important cranial characters. 



Color. Type : Upperparts pale cinnamon, heavily overlaid with smoky 

 brown or Front's brown, thistcolor predominating on top of head and 

 along back, becoming grayish brown on cheeks and middle of face; under- 



