NO. 1317. MAMMALS OF NORTHWEST SUMATRA— MILLER. 447 



Family SCIURID^. 



RATUFA FEMORALIS, new species. 



Ti/pe.^Adu\t female (skin and skull), Cat. No. 114361, U.S.N.M. 

 Collected on Pulo Tuang-ku, Banjak Islands, January 27, 1902, by 

 Dr. W. L. Abbott. Original number, 1479. 



Characters. — General appearance as in Ratufa hangiira/nensis, but 

 color, particularly of face, feet, and under parts not as dark, and short 

 hair of under surface of tail not forming a conspicuous, dark, median 

 stripe. Pale fiank patch more conspicuous than in any other known 

 species. 



Color. — Type: Upper parts and outer surface of liml)s raw sienna, 

 everywhere overlaid with pale ecru-drab, the combination very diffi- 

 cult to describe. The shorter hairs are raw sienna throughout (except 

 slate-gray base), the longer, coarser ones light ecru-dral> with indis- 

 tinct dark tips. Many of the longer hairs are rather distinctly 

 annulated. The general effect is intermediate betw^een the clear, pale, 

 upper surface of Ratufa affin/s and the distinctly grizzled R. j)i/r.s(>nota. 

 On crown and forehead the brown nearly disappears and the ecru-drab 

 lightens almost to cream color. On sides of body and outer surface 

 of legs the ecru-drab gradually gives place to the raw sienna, which 

 darkens nearly to tawny on forearm. Under parts and inner surface 

 of legs raw sienna, paler and duller than that of back and sides 

 and fading almost to buff in axillaiy region and at front of thigh. 

 Pale flank patch well defined, whitish cream buff in strong contrast 

 with surrounding parts. Cheeks and chin to level of ears grizzled 

 smoke gray. Patch 10 mm. in diameter at base of whiskers, whitish 

 gray. Ears concolor with cheeks internally, prouts brown exter- 

 nally. Feet prouts brown, blackening on toes, the brown extending 

 around wrists and ankles, but much mixed W'ith raw sienna on 

 inner side. Tail dark prouts brown, irregularly washed with raw 

 umber (somewhat paler than that of Ridgway), perhaps as the result 

 of incipient bleaching. Most of the hairs of the sides of the tail are 

 dull buff from base to about middle. This color produces a faintl}^ 

 suggested light median area on under surface, but not distinctly 

 enough to form any marked contrast with edge or with the short 

 prouts-brown appressed hairs of median line. 



Skull and teeth. — The skull and teeth closely resemble those of 

 Ratufa hunquranensh., but the interpterygoid space and nasal branches 

 of the premaxillaries are narrower, and the premolar, both above and 

 below, is larger. 



Measurements. — External measurements of type: Total length, 690; 

 head and body, 320; tail vertebra, 370; hind foot, 72 (68). Average 

 of eight 'adults from type locality: Total length, 700 (670-740); head 

 and body, 321 (310-335); tail, 378 (360-405); hind foot, 72.6 (70-76); 

 hind foot without claws, 67 (65-69). For details see table, page 450. 



