258 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



RATUFA CONDURENSIS new species. 



Ti/pe.—Adu\t mule (skin and .skull), Cat. No. 122879, U.S.N.M, 

 Collected on Pnlo Kundur, Rhio-Lin^a Archipelago, June 25, 11)03, by 

 Dr. W. L. Abbott. Orioinal number, 2552. 



C7i(fracters. — Like Ratufa in^'igvix^ but underparts more washed 

 with >'ellowish brown, feet heavily grizzled with tawny and black, and 

 hairs of upper surface of tail noticeably pale through their basal half. 



Color. — The general color is similar to tlfat of Ratufa tnsU/nis, but 

 the entire underparts are strongly suffused with buft'-yellow. This 

 deepens to orange-buff on throat and fades rather abruptly to a light 

 cream-buff' in hypogastric region and on inner surface of thighs. The 

 evident though ill-detined line separating color of sides from that of 

 underparts is very nearl}' the tawny of Ridgway. Feet grizzled with 

 tawny and blackish, the ends of the toes darker. Entire face in front 

 of ears lightly grizzled hj minute whitish annulations on most of the 

 hairs. The grizzle tends to become a whitish wash in front of eyes. 

 Tail as in Ratufa inmgnls., but liasal half of the hairs of upper surface 

 cream- buff', whitening proximally, and showing through noticeabl}' at 

 surface even when the hairs are not disarranged. 



Sl'ull and teeth. — The skull and teeth do not differ appreciably from 

 those of Ratufa insignis. 



Measurements. — For measurements see table, page 260. 



Reniafrks. — This squirrel is a member of a group of closely-related 

 forms which are, so far as now known, conffned to the Rhio-Linga 

 Archipelago. As a group they may be at once recognized by the uniform 

 dark umber-l)i"own upper parts and tail (most of the hairs of the back 

 and sides showing minute inconspicuous annulations near tip), sharply 

 contrasted whitish cheeks, muzzle, and underparts, and usually whitish 

 feet. The pale thigh patch is present but conffuent with the light 

 color of inner side of leg. Among themselves the ffve species now 

 known differ as follows: 



KEY TO SPECIES. 



Entire face conspicuously suffused with white. 



Hind foot al)out 82 (78); greatest length of skull about 68 Ratufa notabilis 



Hinrt foot about 75 (65); greatest length of skull al)out 64. • 



Ratufa cai'imoriensis 

 Entire face brown, rather inconspicuously grizzled with white. 



Brown of sides sharply contrasted with cream-buff of underparts without 



intervening tawny line Ratufa conspicua 



Brown of sides separated from cream-buff or orange-buff of underparts by 

 a noticeable tawny line. 



Feet clear whitish; hairs of upper snrface of tail not conspicuously pale 



on basal half Ratufa insignis 



Feet heavily grizzled; hairs of upper surface of tail conspicuously pale 

 on basal half Ratufa condurensis 



