1899-] Allen, New Rodents from Colombia and Venezuela, 211 



gray to flesh color ; tail long, dark brown, nearly unicolor, naked except to- 

 wards the tip, where it is scantily clothed but not penicillate. 



Measurements. Type, total length, 269 mm. ; head and body, 119 ; tail 

 vertebrae, 150 ; hind foot, 21.5, with claws, 24 ; ear, 19. Four adults measure 

 as follows : Total length, 260 (238-281) ; tail vertebrae, 146 (135-162) ; hind 

 foot, 25 (24-26) ; ear, 17 (16-19). 



Skull (of type), total length, 31 ; basal length, 24 ; zygomatic width, 16.6 ; 

 mastoid width, 12.4 ; interorbital width, 5.3 ; nasals, n ; palatal length, 7.2 ; 

 palatal foramina, 6.5 ; upper toothrow, 5 ; lower jaw, length (condyle to in- 

 cisor tips), 20 ; height, angle to condyle, 7.8. 



Oryzomys palmarius is based on five adult specimens, four of 

 which are from Quebrada Secca, and one from Los Palmales, 

 taken Nov. 26 to Dec. 10, 1898, by Mr. F. W. Urich. One, a 

 young adult, differs a little from the others in being darker and 

 less fulvous. 



This species is a very near ally of Oryzomys trinitatis Allen & 

 Chapman, from Trinidad. It differs from it in being decidedly 

 smaller and paler, and in having a grayer head and face. In 

 proportions, in the texture of the pelage, and in cranial characters 

 (except in the much smaller size of the skull), there is a close 

 similarity. The tail, however, is slightly villous, especially to- 

 ward the tip, and not naked, as in O. trinitatis. It is very much 

 smaller and otherwise very different from either O. meridensis 

 Thomas, or O. vestitus Thomas, both from the vicinity of Merida. 



Oryzomys tenuicauda, sp. nov. 



Type, No. 14737, $ ad., Los Palmales, Venezuela, Dec. 5, 1898 ; F. W. 

 Urich. 



Pelage long and soft. Ears of medium size. Color above dark fawn brown, 

 shaded on the back with dusky, and passing into bright fulvous on the sides ; 

 below clear white, basal half of fur plumbeous ; ears brown, slightly hairy ; 

 tail dark brown, unicolor, basal third nearly naked, middle portion well haired, 

 the hairs increasing in length and thickness on the apical half, hiding the 

 scales, and at the tip forming a thick pencil 10 mm. long ; fore feet buff ; hind 

 feet short, the edges and toes buff, with a dusky median band to the base of 

 the toes. 



Measurements. Type, total length, 216 mm. ; head and body, 88 ; tail 

 vertebrae, 128 ; hind foot, 20.5, with nails, 23 ; ear, 19. 



Skull, total length, 27 ; basal length, 20.5 ; zygomatic width, 15 ; mastoid 

 width, ii ; interorbital width, 5 ; length of nasals, 8 ; palatal length, 4 ; 



