BANGS: CHIEIQUI MAMMALIA. 



31 



interparietal narrower ; palatal slits much narrower and longer — less rounded 

 in shape. 



From N. sumichrasti or N. sa/t-mi (probably distinct species, as suggested by 

 True, Proc. U. S. Nat. Mus., Vol. XVI. p. 690), the new species differs in its 

 much yellower less ferruginous color above, in its blackish ears and tail, and 

 in its larger size. 



Color. — Upper parts, yellowish cinnamon, duller, more Isabella color on 

 top of head, darkened along middle of back, head, and rump by a slight admix- 

 ture of brown tipped hairs ; lower sides brighter, decidedly shaded with orange- 

 buff ; orbital ring and space between base of whiskers and eye black ; top of 

 nose pale Isabella color; whiskers, very long, mixed black and colorless; under 

 parts, pure, snowy white to base of hairs ; ears, sparsely haired dusky ; tail 



11. X If 12. X If 



Figs. 11 and 12. Nyctomys nkellinus. Type. 



well haired, the hairs gradually becoming longer toward tip, and ending in a 

 pencil, unicolor, blackish; hands white ; feet — toes and sides of tarsus white, 

 central portion of tarsus, dark brown. 



The type and Nos. 10,245 and 10,246 are practically alike in color, the other 

 three, all younger, are paler, grayer, more Isabella color above ; the lower sides 

 are cinnamon without the bright orange-buff shade of the older specimens. 



Measurements — 



