Mcrriam American Wood Rats. 121 



cuities large ; basisphenoid spine about the same breadth as presphenoid. 

 Dental characters. Molars large, very broad anteriorly (m 1 nearly J 

 broader than m 3 ), and white the whiteness due in part to the absence of 

 color in the osteodentine, which is dark in other species, and in part to the 

 absence of the usual dark fillings in and about the reentrant angles. M l 

 with only 2 salient angles and 1 vertical slit on inner side, the anterior loop 

 being undivided ; crown of m- a trefoil, the anterior lobe pyriform ; m T 

 with antero-internal sulcus obsolete, and middle loop more transverse than 

 in micropus. 



General remarks. Specimens of this new species have been ex 

 amined from La Parada, San Luis Potosi, Berrizoabal, Zacatecas 

 and Perote, Vera Cruz. The Perote specimens are somewhat 

 smaller and have the postpalatal notch narrower and the nasals 

 more acutely pointed behind. 



Neotoma latifrons sp. nov. 



Type from QUERENDARO, MICHOACAN, MEXICO. No. 50,135 ^ ad. U. S. 

 Nat. Museum, Department of Agriculture Collection. Collected August 8, 

 1892, by E. W. Nelson (Original number 3058). 



Measurements (taken in flesh). Type: Total length 350; tail vertebrae 

 149 ; hind foot 42. Ear from anterior base 26 (in dry skin). 



General characters. Similar to N; leucodon but smaller, with 

 smaller ears, shorter tail, longer hind feet, and cranial differences. 



Color. Upper parts ochraceous buff tinged with fulvous and moderately 

 lined with dark hairs ; the fulvous tinge strongest on sides where it runs 

 forward to cheeks ; under parts and feet white, the white of belly and chin 

 clouded with plumbeous from under fur ; tail indistinctly bicolor, dusky 

 above, becoming soiled whitish beneath. 



Cranial characters. Skull similar to that of N. leucodon but differing in 

 having the frontal platform even broader, its sides strongly spreading imme 

 diately behind interorbital constriction, and forming a projecting angle be 

 fore leaving orbital fossa ; skull as a whole shorter and relatively broader ; 

 molars narrower and less crowded ; m * with antero-internal sulcus more 

 pronounced. 



Neotoma fulviventer sp. nov. 



Type from TOLUCA VALLEY, MEXICO. No. 50,165 9 ad. U. S. Nat. 

 Museum, Department of Agriculture Collection. Collected Nov. 5, 1892, by 

 E. W. Nelson (Original number 3744). 



Measurements (taken in flesh). Type: Total length 350; tail vertebrae 

 160; hind foot 34. Ear from anterior base 26 (in dry skin). 



General characters. Similar to Neotoma tenuicauda but larger, 

 darker, and under parts dull fulvous instead of white. Ears 

 and feet small ; tail slender ; texture of pelage fine and soft. 



