NO. 1498. MA3fMALS OF BANK A AND BILLITON—LYON. 593 



I}/7>t'.— Adult female, skin and skull, Cat. No. 124977, U.S.N.M., 

 collected at Budinj^ Bay, island of Billiton, between Sumatra and 

 Borneo, August 5, 1904, b}^ Dr. W. L. Abbott. Original number 3539. 



Dlagnodic characters. — Similar to Sciurus peninsularis and to S. 

 tedongus. Black and white stripes on sides not so wide and clear as in 

 S. peninsularis. Tip of tail not so much inclined to reddish as in 

 either. Outer surface of legs and i;pper surface of feet suffused with 

 orange-rufous of underparts as in S, tedongus., much more than in S. 

 peninsularis. Maxillary tooth row averaging about 1 mm. longer 

 than in S. 2)e7iinsularis, vittatus or tedongus. 



Color. — Type: Upper parts and tail a tine grizzle of black and a 

 color lying between ochraceous-buff and a pale tawny olive; the black 

 rather in excess on the body, and the two about equally mixed in the 

 tail. Underparts and inner surface of legs ochraceous rufous. A 

 slight wash of this color extends on the outer surfaces of the legs, 

 becoming marked on the upper surface of the feet. Lateral stripes as 

 in Sciurus vittatus from Tapanuli Bay, Sumatra, the outer about 3 

 mm. wide at the middle, dirty buff, the inner about 7 mm. wide, black 

 with a ver}^ slight grizzling of the ochraceous rufous of the under- 

 parts. Sides of head and under surface of tail similar to outer surface 

 of legs. 



Measurements. — See table, page 592. 



Specimens examined. — Thirteen; see table, page 592. 



Remarhs. — This squirrel is distinguishable in color from Sciurus vit- 

 tatus (Tapanuli Bay, Sumatra) by its less yellow cheeks and distinctly 

 rufous feet. From S. peninsularis it is distinguished b}^ the narrow 

 dirty buff instead of whitish cream-buff side stripe and by the nar- 

 rower, less clear, black stripe and the greater suff'usion of the ochra- 

 ceous rufous of the underparts on the feet and by the greater length 

 of the maxillary tooth row. Skins of S. hillitonus are almost indis- 

 tinguishable from skins of S. tedongus., but the hind foot averages a 

 little longer (see table, page 592), and the tips of the tails are not so much 

 inclined to reddish. The skulls of the Banka and Billiton squirrels 

 are easily separable by the greater length of the maxillary tooth row 

 of the latter. (See table, page 592.) 



SCIUROPTERUS VORDERMANNI Jentink. 



1890. Sciuropierus vordermamil Jentink, Notes Leyden Museum, XII, p. 150, 



pi. VII, figs. 13 and 14, March, 1890. 

 1905. Sciuropterus vorderinanni Willink, NatuurkundigTijdschrift Nederlandsch- 



Indie, LXV, p. 233. 



Doctor Abbott secured one specimen, an adult female, at Buding 

 Bay, Billiton. Its colors differ in no essential respects from those given 

 in the original description. The skull is exactly like the figures of the 

 type. Measurements: Cat. No. 124986, U.S.N.M. Head and body, 

 103 mm.; tail vertebrjp, 100; tail to end of hairs, 113; hind foot with 



Proc. N. M. vol. xxxi— 06 39 



