Descriptions of Nine New Mammals. 167 



Genernl Character?:.'- — Size very large, about efiualling' G. mexi- 

 caiius, l)iit ditfering conspicuously from that species in liaving 

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

 inedian furrow. Color of type and other specimens from tlie 

 Zapotlan valle}', uniform reddish l>rown with a dusky or fuligin- 

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

 mens from tlie base of the neighboring mountains (Sierra Nevada 

 de Colima, Jalisco), here referred to the same s})ecies, are much 

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

 plumbeous. Tiie latter, Mr. Nelson states in his notes, occur 

 in company with the small species here described as Geomys 

 nelson i. 



The skull of this sjiecies is huge, and the under jaw in [)ar- 

 ticular l^ears a striking sui)erficial resemblance to that of .l/;/o- 

 duDtid. The angular processes project out laterally to a consider- 

 ablv groatcn' distance than in Gr()mi/'< mr.rinnii'ft. 



Genus Neotoma. 



The collection contains a series of two heretofore unknown 

 species of Neotoma. The first of these, obtained at ^lanzanillo, 

 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- 

 si)icuous an animal should have escaped description until the 

 present time, particularly since it is common in the iumiediate 

 neigld^orhood 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 tlian 20 specimens in excellent 

 condition. 



The other species {N. temdcauda) 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 lie known from the accompanying de- 

 scriptions : 



2:i— Bioi.. Soc. Wash., Vol. Vfl, 1892. 



