NO. 1485. MAMMALS FROM RHIO-LINGA ISLANDS— MILLER. 259 



RATUFA CONFINIS, new species. 



1902. Ratufa affinis Miller, Proc. Acad. Nat. Sci. Philadelpliia, p. 149, June 11, 

 1902. Not Sciurus affinis Raffles. 



Ti/pe.— Adult female (skin and .skull), Cat. No. 113134, U.S.N.M. 

 Collected on Sinkep Island, Rhio-Linga Archipelago, September 3, 

 1901, by Dr. W. L. Abbott. Original number, 1265. 



C/iaracters. — Similar to Rat-ufd affinh but slightly larger; skull vvitli 

 larger and more elongated audital bullae 



Color. — The color so exactly resembles that of Ratufa affinis as to 

 need no detailed description. 



Skull and teeth. — In general the skull and teeth resemble those of 

 Ratufa affinis. The size of the skull, however, is slightl}^ greater, 

 and the difference aj^pears to be constant. In seven adults of the 

 Sinkep animal the greatest length of the skull averages ^'o mm, , with 

 extremes of 'oAi.'Q and 68, while in eight adults of Ratufa affinis the 

 average is 63.3, the extremes 63 and 64. The audital bulla3 are rela- 

 tively larger than in Ratufa affinis., and with the same constancy. In 

 the specimens just mentioned their greatest diameter is: confinis., 16.4 

 (1.5.8 to 17); affinis., 14.5 (14 to 15). The teeth of the two animals do 

 not diti'er appreciably. 



Measurements. — For external measurements see table, page 260. 



Cranial measurements of type: Greatest length, 'io'6 (64)" mm.; basal 

 length, 57 (54); basilar length, 52.4 (49); length of nasals along 

 median suture, 21 (20); breadth of both nasals together anteriorly, 11.8 

 (12); breadth of both nasals together posteriorly, 8 (10); diastema, 

 14.8 (14.4); least interorbital breadth, 20 (22); zygomatic breadth, 40 

 (40.4); mandible, 42 (40); maxillary molar series (alveoli), 13 (12.6); 

 mandil)ular molar series (alveoli), 13.8 (14). 



Specimens examined. — ^Twelve; all from Sinkep Island. 



Remarks. — Since I recorded this animal in 1902, Doctor Abbott has 

 obtained a sei-ies of Ratufa affinis in Joliore and Pahang. This addi- 

 tional material shows that the Sinkep form is distinct. 



« Measurements in parentheses are those of an adult female Ratufa affinis from 

 Rnmpin River, Pahang (No. 116ii88). 



