94 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



the skull from 62.5 to 66; in R. ephippium these ranges are 85 to 90 

 and 63.4 to 68.5. (For measurements of the series see table, p. 96.) 



Specimens examined. — Twenty-three, from western and southwest- 

 ern Borneo. (For exact localities see table, p. 96, four from along 

 the Kapuas River not included.) 



Remarks. — This is the same species that I called Ratufa ephippium 

 (Miiller) in 1907. 1 At that time there were no specimens of true 

 ephippium in the museum collection. It is not at all unlikely that 

 the forms of Ratufa on the mainland of Borneo, baramensis, san- 

 dakanensis, cothurnata, and ephippium, represent local races of one 

 species, but at present intergradation is not known. 



RATUFA GRISEICOLLIS, new species. 



Type. — Skin and skull of adult male, Cat. No. 145372, collected on 

 Panebangan Island, west coast of Borneo, May 24, 1907, by Dr. W. L. 

 Abbott. Original number, 5315. 



Diagnostic characters. — A richly colored species of the ephippium 

 group related to Ratufa cothurnata above, from the neighboring main- 

 land of Borneo, but back darker, sides and under parts more rufous, 

 and sides of neck gray. 



Color. — Upper parts of head and body in the middle line blackish ; 

 some light-colored hairs over nose, and in the type over back of 

 neck; sides of body and shoulders rich cinnamon-rufous, grizzled with 

 blackish; the shoulders contrasting with the black of the back, but 

 elsewhere the latter color blends in with the sides; under parts of 

 neck and body and inner side of thighs and legs orange-buff , rather 

 richer than that of Ridgway; thighs similar to sides, becoming dull 

 orange-rufous on the hind feet; upper and lateral aspect of tail 

 brownish black, inner half of the long hairs on under side of tail 

 buffy, the short hairs in median line tawny with slight grizzling of 

 blackish. 



Skull and teeth. — I can find no characters by which the skull and 

 teeth of Ratufa griseicollis may be distinguished from those of R. 

 ephippium or R. cothurnata. 



Measurements. — See table, page 96. 



Specimens examined.— -Three, all from Pulo Panebangan. 



Remarks. — Ratufa griseicollis, while clearly related to R. cothurnata, 

 from Borneo, is very distinct and easily recognized by its gray neck, 

 rufous under parts, and generally richer coloration. Head and body 

 measurements of R. griseicollis are somewhat greater than corre- 

 sponding measurements in mainland specimens. 



RATUFA VITTATA, new species. 



Type. — Skin and skull of adult female, Cat. No. 151758, collected 

 at Saratok, on Pulo Laut, off southeast coast of Borneo, December 

 19, 1907, by Dr. W. L. Abbott. Original number, 5632. 



i Proc. U. S. Nat. Mus., vol. 33, No. 1577, p. 557, December 24, 1907. 



