Descriptions of Nine New Mammals. 167 



General Character*. Size very large, about equalling G. mexi- 

 caiiiix, but differing conspicuously from that species in having 

 the tail naked instead of hairy. Upper incisors with a single 

 median furrow. Color of type and other specimens from the 

 Zu.potla.ii valley, uniform reddish brown with a dusky or fuligin- 

 ous patch behind each ear and a larger one on the nose. Speci- 

 mens from the base of the neighboring mountains (Sierra Nevada 

 do Colima, Jalisco), here referred to the game species, are much 

 darker, and two from high altitudes are uniform dark sooty- 

 pi iiinbeous. The latter, Mr. Nelson states in his notes, occur 

 in company with the small species here described as Geomys 

 nelsoni. 



The skull of this species is huge, and the under jaw in par- 

 ticular bears a striking superficial resemblance to that of Aplo- 

 dmtl'ui. The angular processes project out laterally to a consider- 

 ably greater distance than in Geoiny* nie.ric<inus. 



(icims Neotoma. 



The collection contains a series of two heretofore unknown 

 species of Neotoma. The first of these, obtained at Manzanillo, 

 in the state of Colima, is the largest and handsomest species 

 known, and I take pleasure in naming it Neotoma alleni, after Dr. 

 J. A. Allen, of the American Museum of Natural History, in New 

 York, in recognition of his valuable contributions to the mam- 

 malogy of Mexico. . It is remarkable that so large and con- 

 spicuous an animal should have escaped description until the 

 present time, particularly since it is common in the immediate 

 neighborhood of one of the principal seaports of western 

 Mexico. In the pattern of the enamel folds of the last lower 

 molar it differs conspicuously from typical Neotoma, as pointed 

 out in detail beyond, and may merit subgeneric recognition. 

 It is represented by more than 20 specimens in excellent 

 condition. 



The other species (A 7 , tenmcauda) is much smaller, less than 

 half the size of N. alleni, and was obtained in the Sierra Nevada 

 de Colima, in the state of Jalisco. It is represented by seven 

 specimens. 



The two species may be known from the accompanying de- 

 scriptions : 



2:i Rror,. Sor. WASH., VOL. VII, 1892. 



