Descriptions oj Xine Xew Jlamntals. 171 



three .spoeimens have Ijeen received (nnn ]Mr. Nelson from 

 Coliimi C'ity and Arineria, Colinia. and from I'luntinar and 

 Zapotlan, Jalisco. 



Color. — Upper parte uniform di'al)-gray. slightly grizzled ^vitll 

 l)lack-tij)ped hairs and faintly tinged with taAvny, precisely as 

 in Mia ii^u.-iciiliis; under parts huffy, the l)asal part of the hairs 

 l)lumbeous, without sharp line of demarkation; tail above, con- 

 color with hack ; slightly paler below. 



Cranial and Dental Character'^. — Skull similar to that of aS'. tciij- 

 lori, l)ut larger; first and secc«id upper molars relatively shorter 

 and thicker; anterior cusp of first ujDper molar not distinctly (if 

 at all) bi-tuberculate when young ; in ♦S'. taylori it is conspicu- 

 ously In-tuberculate. 



(Jen.ux Arvicola. 



^Ir. Nelson obtained a series of 18 specimens of a new 

 species of Arvicola on the Sierra Nevada de Colima, in the state 

 of Jalisco, Mexico, during the latter part of April, 1892. The 

 species l)elongs to the western section of the subgenus Mijnomc-^ 

 (characterized by lacking the postero-internal loop of the middle 

 ujjper molar) and is related to Arvicola mogollonensis of Mearns 

 from the i»ine plateau region of Arizona, Init is larger, with the 

 tail and hind feet longer, and is much darker m color. It difiers 

 also in cranial characters. 



Arvicola phaeus sp. nov. 



Type Xo. HHo 9 ad- U. S. Xatioual ^Museuiu (Department of Aifricult- 

 iire euUection ). From nortli slope of the Sierra Xevada de Colima, Jalisco, 

 Mexico (altitude, 10,000 feet\ April 21, 18!)2. Collected by E. W. Xelson- 

 (Original num])er, 2-")l(i.) 



Meamrcinent>i (in millimeters, taken in flesh by collector). — 

 Total length, 155; tail vertebra^ 34; hairs, 4; hind foot, 20 2 ; 

 ear from anterior root, 14 (in dry skin). 



Color. — Upper })arts dark bistre, grizzled, and thickly inter- 

 spersed with long black-tipped hairs ; under parts i^lurabeous, 

 more or less washed with dilute tawny-drab ; tail indistincth^ 

 bicolor, sooty above, paler IjcIow. 



