MAMMALS COLLECTED BY DR. W. L. AHJJOTT 217 



posterior extremity of nasals iS. 6 (1S.8); mandible 41 (41.6) depth 

 of mandible at posterior root of premolar 11.4 (11) ; maxillary tooth- 

 row (alveoli) 13 (14) ; breadth across both upper incisors together at 

 rim of alveoli 8.4 (8) ; mandibular toothrovv (alveoli) 14 (14.4). 



Specimens examined. — Five, all from the type locality. 



Remarks. — Ratufa tiomanensis is less differentiated from R. 

 melanopepla than is the Anambas form. Nevertheless its characters 

 are easily recognizable on comparison, while their constancy is very 

 marked. 



FUNAMBULUS CASTANEUS sp. nov. 



Type. — Immature male (skin and skull). No. 101696 United 

 States National Museum. From Pulo Siantan, Anambas Islands. 

 Collected September 10, 1899. 



Characters. — Similar to the form of Funambulus insignis occur- 

 ring in Trong, Lower Siam, but darker in color, and sides and flanks 

 not grizzled ; skull with much larger audital bullae. 



Color. — Sides, flanks, and outer surface of legs clear chestnut, the 

 individual hairs slate-gray at base, ferruginous at middle and black at 

 tip. The color is brightest on flanks and palest on front legs and 

 sides of head. Neck and middle of back grizzled gray faintly washed 

 with tawny. Top of head similar but with tawny tinge more con- 

 spicuous. In lumbar region and on rump the gray gives place grad- 

 ually to color of flanks. The gray area is bounded on each side and 

 divided in the middle by a black stripe about 3 mm, in breadth. These 

 three black stripes begin a little in front of shoulders and extend to 

 rump, where they disappear. The two strijDCs into which the gray 

 area is thus divided are each about 5 mm. in width. Ventral surface 

 of body and inner side of legs soiled yellowish white to base of hairs, 

 the inner side of hind legs strongly washed with ferruginous. Feet a 

 dull grizzle of black and tawny. Ears brownish internally, whitish 

 externally. The hairs of the tail are black at base (3 mm.) then 

 light, dull ferruginous (5 mm.), followed by black (lo mm.), the 

 extreme tips whitish. On dorsal surface the ferruginous is nearly con- 

 cealed by the black, but on ventral surface it forms a well-defined 

 median area. 



Skzill. — The type specimen is so young that no accurate description 

 of the cranial characters can be given. The audital bullae, however, 

 are actually larger than in a fully adult specimen of Funatnbulus 

 insignis from Trong. They are so large that when viewed from 

 the side they conceal the tips of the pterygoids, which in F. i?zsignis 

 are plainly visible. 



