6 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



Color. — Upperparts of type exactly as in Ratufa insignis except 

 that the neck and shoulders are more conspicuously speckled by the 

 light annulations of the hairs. Underparts and inner surface of legs 

 cream-buff not tinged with yellow. This color is everywhere sharply 

 defined against the brown. There is a faint trace of the tawny 

 edging between the two colors on hind legs, but to a much less ex- 

 tent tlian in either of the other species. 



The skins show practically no variation in color beyond that due 

 to bleaching. 



Skull and teeth. — In form the skull is similar to that of Ratufa 

 insignis, but in size it is not as large. Teeth as in the related species. 



Measurements. — External measurements of type : total length, 

 705; head and body, 330; tail vertebrae, 375; hind foot, yy (72); 

 ear from meatus, 25.6; ear from crown, 13. 



Cranial measurements of type : greatest length, 63 ; basal length, 

 54; basilar length, 50; length of nasals, 20.4; diastema, 14; least in- 

 terorbital breadth, 24 ; breadth of braincase above roots of zygomata, 

 27.4 ; zygomatic breadth, 39 ; mandible, 38.8 ; maxillary toothrow 

 (alveoli), 12.8; mandibular toothrow (alveoli), 12.8. 



Specimens examined. — Seven, all from Pulo Bintang. 



RATUFA BAL^ sp. nov. 



Type. — Adult male (skin and skull). No. 121,715, United States 

 National Museum. Collected on Tana Bala, Batu Islands, Sumatra, 

 February 5, 1903, by Dr. W. L. Abbott. Original number, 2224. 



Characters. — Similar to Ratufa femoralis but much darker ; back 

 darker than belly ; tail blackish. Crown and forehead not notice- 

 ably lighter than back. Femoral spot large and conspicuous. 



Color. — Type : upperparts wood-brown faintly washed with 

 vandyke-brown along middle of back, and showing strong drab re- 

 flections in certain lights. On sides the brown brightens to a 

 brownish buff and the shorter hairs show distinct light annulations. 

 The speckling thus produced is inconspicuous. Crown and fore- 

 head like sides but not quite as dark. Cheeks slightly tinged with 

 gray. Ears and indistinct eye ring blackish. Whiskers black, their 

 bases surrounded b}^ a whitish patch. Outer surface of legs like 

 sides but strongly tinged with ochraceous-rufous. This is particu- 

 larly noticeable on front legs between shoulder and wrist, where 

 a clear band is formed between colors of outer and inner surfaces. 

 Feet blackish. Underparts and inner surface of legs clear orange- 

 buff, darker along median line, paler in axillary region. Chin dark 

 grayish. Femoral spot whitish, large and well defined. Entire tail 



