1899-] Allen, New Rodents from Colombia and Venezuela. 209 



all from Valparaiso (altitude 4500 feet), except one, which is 

 from Minca (altitude 2000 feet). The adults vary a little in the 

 amount of black intermixture in the dorsal area, the Minca speci- 

 men, referred here doubtfully, having quite a distinct median 

 blackish- area. 



This species appears to be related to O. gracilis Thomas, from 

 Goncordia, Medellin, Colombia, resembling it in proportions, in 

 its soft velvety pelage, and in the general coloration of the upper 

 parts. It is, however, not white on the under surface, and is 

 very much larger. It also greatly resembles O. magdalena of the 

 present paper, but is much paler above, and also very much 

 larger. That- the specimens of O. mollipilosus are adult is evinced 

 by the fact that two of the females were nursing young. 



Oryzomys magdalenae, sp. nov. 



Type, No. :i53iS, ? ad., Minca (alt. 2000 ft.), Santa Marta District of 

 Magdalena Province, Colombia, August 3, 1899 ; Coll. H. H. Smith. 



Pelage, short, very soft, and velvety. Above strong yellowish brown, much 

 varied with black, especially along the median area, paler, uniform yellowish 

 brown on the sides ; below uniform whitish 'gray, the hairs plumbeous at base, 

 and the pelage very thick, short, and velvet y ; ears blackish brown, of medium 

 size, naked ; tail brown, scarcely lighter below, naked, very finely scaled ; feet 

 flesh color. 



Measurements. Type, total length, 244111111.; tail, 144 ; hind foot, 33; ear 

 (in dry skin), 15. Another specimen, $ ad., from Valparaiso, measures as 

 follows : Total length, 234 ; tail, 135 ; hind foot, 29, with claws, 32. * 

 V Skull, total length, 31.5; basal length, 25 ; zygomatic width, 15; mastoid 

 width,' 1 2. 2; interorbital width, 5.3 ; length of nasals, 12; palatal length, 7 ; 

 length of, palatal foramina, 3.4 ; length of upper toothrow, 4.3 ; length of lower 

 jaw, 19.2; height at condyle, 7; height at coronoid,, 7; length of lower 



toothrow, 4.8. 



I 



Oryzomys magdale/ioz is based on two specimens, one of which, 

 a female, is from Mirica and the other, a male, from Valparaiso. 



/This,: species belongs to the same ,group ; as O,ryzajnys gracilis 

 Thomas, and O. mollipilosus of the present paper, and perhaps O, 

 velutinus Allen & Chapman from Trinidad. The latter, how- 

 eVer, is larger and much redder,'and has much larger ears. O. 

 mollipilosus. is., as regards 'gen era! features, a miniature of 0. magda- 

 &#<, but is paler, as well as .much smaller, and has a relatively 

 m.uqh ,shprter tail. - , 



Novem ber, i8gq. ] 14 



