BANGS: CHIRIQUI MAMMALIA. 31 
interparietal narrower ; palatal slits much narrower and longer — less rounded 
in shape. 
From N. sumichrasti or N. salvini (probably distinct species, as suggested by 
True, Proc. U. 8. 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 
WEN eg E 
Figs. 11 anp 12. Nyctomys nitellinus. 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 — 
No. Sex. Total length. Tail vert. Hind foot. Kar. 
10.247, © ad: 250 120 25 Ny 
10,248 Q ad. 250 125 25 17 
10,249type @ old ad. 260 125 24 7 
10,250 g young 215 90} 23 1 
10,246 & old ad. 240 1071 22 17 
10,245 & ad. 185 55 1 25 17 
1 End of tail gone. 
VOL. XXXIX. — NO. 2, 2 
