590 PROCEEDINGS OF THE NATIONAL MUSEUM tol. xxxi. 



Diagnostic characters. — Similar to Sciurus ca,rhnatdd Miller, but 

 underparts and shoulder darker. Differs from Sciurus raffiesi in its 

 much lighter shoulder. 



Color. — Type: Upper parts of head, neck, and body and a narrow 

 stripe on outer surface of hind leg- black. Underparts, fore leo-s, and 

 feet, and inner surface of hind legs and feet, deep, rich ferruginous,- 

 brightest on the throat, darkest on the forearm and on the feet, where 

 the color approaches hazel. The white stripe extends from behind the 

 shoulder to the heel. In the region of the hips it is widest and 

 encroached on liy the black, which makes a slight grizzle. Area at 

 base of whiskers and chin, white slightly grizzled with black. Sides 

 of head and neck a fine grizzle of black and white, the former in 

 excess. White spot on cheek indistinct. Shoulder orange-ochraceous, 

 grizzled with black, due to bases of hairs showing, blending in with 

 the deep rich ferruginous of the arm, and with the white of the side 

 stripe. Tail uniformly black, but not so deep and clear as on the back. 



Skull. — Not distinguishable with certainty from that of Sciunts 

 carijjiatce; maxillary tooth row a little longer. 



Jleasurenients. — External measurements of the type: Figures in 

 parentheses are measurements of a cotype of ASciu/'us rajflesi (No. 84.0, 

 3.8, Sumatra Raffles — British Museum) and the type of S. carimatse. 



Total length, U8 mm, ( , 428); head and body, 238 ( , 243); tail 



vertebra?, 210 ( , 185); hind foot with claws, 55 (56, 52); hind foot 



without claws, 51 (51, 47). 



Cranial measurements of the type, of a cotype of *S'. rafflesi and the 

 type of S. cari/natx: Greatest length, 54 mm. (55, 53.5); basal length, 

 46.5 (48.6, 46.5); basilar length, 43.5 (45.6, 43.5); palatilar length, 23.5 

 (24.8, 23); diastema, 13.5 (13.6, 13); zygomatic breadth, 33 (31, 32.5); 

 interorbital constriction, 22 (23, 21); least depth of ramus of mandible 

 in front of tooth row, 5 (5, 5); maxillary tooth row (alveoli), 11.25 

 (11.4, 10); mandibular tooth row, 11 (11.4, 10). 



Specimens examined. — See table, page 591. 



RemarTts. — The series of specimens is very uniform in color and 

 pattern, and none show any deviation from the type. Sciurus men- 

 danauus is easily distinguishable from -6'. carimatse by its darker 

 shoulder and underparts and by the greater length of the tooth rows 

 of the skulls. From S. rafflesi of Sumatra it differs in its slightly 

 smaller size and much lighter shoulder. Mr. Miller, in comparing 

 specimens of S. melanops with cot3'pe No. 84.6, 3.8 of ,5'. rafflesi 

 from Sumatra, in the British Museum, noted that the shoulder in the 

 latter has the palest red, about the same in color as the darkest at the 

 side of the wrist of a specimen of S. melandps (Cat. No. 113153, 

 U. S. N. M.) — that is, a deep rich ferruginous of Ridgw^ay. His notes do 

 not show whether or not the shoulder of S. rafflesi is grizzled as it is in 

 8. mendanauus^ but if it is he would hardly have failed to remark on 



