32 Goldman — Twelve New Wood Rats. 



General characters. — Similar to N. micrnpva, but differing in somewhat 

 smaller size, decidedly brownish color, and slight cranial characters. 



Oi/or — Type: Upper]>arts nearly uniform grayish brown, moderately 

 darkened on middle of face, top of head and along back by blackish 

 hairs; underparts white; the fur i)lunibeous basally except on throat, 

 pectoral and inguinal regions, where the hairs are pure white to roots ; 

 nose dusky ; ears thinly clothed with comparatively long, brownish hairs; 

 feet white; tail sharply bicolor, blackish al)ove, whitish below. 



Cranial, charactrrx. — In general firm the skull agrees with that of N. 

 micropas, but averages smaller; dentition usually less heavy ; interpterygoid 

 fossa narrower, encroached upon anteriorly by a short but more or less 

 spinous projection from palate as in N. mici-opus. 



Measurement^.— Type : Total length, 366 ; tail vertebrse, 166 ; hind foot, 39. 



Neotoma micropus planiceps subsp. nov. 



Type from Rio Verde, San Luis Potosi, Mexico (altitude, 3000 feet). 

 Adult male. No. 82,105, U. S. National Museum, Biological Survey Collec- 

 tion. January IG, 1897. E. W. Nelson and E. A. Goldman. Original 

 number 10,461. 



General characters. — Size slightly smaller than N. micropus ; color more 

 buffy instead of drab gray; skull flatter and less angular. 



Color. — Upperparts pale buffy gray, soinewhat obscured by dusky hairs 

 which are most abundant along the median line of the back ; underparts 

 white, the fur pale plumbeous basally along sides of belly and inner surface 

 of hind legs ; nose, eyelids and ankles dusky ; feet white ; tail thinly haired, 

 bicolor, brownish black above, grayish below. 



Cranial characters — Skull similar in general to that of i\^. micropus, but 

 smaller and less arched ; frontals flatter above, the sides not upturned nor 

 projecting as supraorbital shelves ; braincase more smoothly rounded, bulg- 

 ing posteriorly below lambdoid crest; nasals attenuate posteriorly, the' ends 

 pointed and deeply emarginate ; interpterygoid fossa Aery broad as in 

 N. micropus. 



Measurements. — Type: Total length, 351; tail vertebrse, 167; hind 

 foot, 38. 



Neotoma stephensi sp. nov. 



Type from Hualpai Mountains, Arizona (altitude, 6300 feet). Adult 

 female. No. 117,466, U. S. National Museum, Biological Survey Collection. 

 July 1,1902. F. Stephens. Original number 4192. 



General characters. — Size small, fur long, soft and silky ; tail slightly 

 bushy, nearly concolor ; belly pinkish buff. Similar in general to A\ lepida, 

 but hind foot larger, differing also in color and cranial characters. 



Color. — Type: Uppeiparts grayish buff, palest on head, becoming pinkish 

 buff along cheeks and sides, well mixed on d©rsal region with brownish 

 hairs ; underparts strongly washed with pinkish buff, this color spreading 



