1902.] NATURAL SCIENCES OF PHILADELPHIA. 151 



r)^ ; basilar length, 5.) ; length of nasals, 22 ; least iuterorbital 

 breadth, 27.4; zygomatic breadth, 44; mandible, 45; maxillary 

 molar series (alveoli), 18; mandibular molar series (alveoli), 15. 



Specimens Examined. — Two, both from the type bcality. 



Remarks.— Ratufa notabilis is such a conspicuous, easily recog- 

 nizable species that it requires no comparison with its allies. The 

 Javan squirrel described by Desmarest under the name Sciurxis 

 albiceps has a similar whitish face; but Desmarest' s animal was 

 much smaller than Ratufa notabilis, and will doubtless prove to be 

 the Javan representative of jB. hypoleuca. 



The two specimens are in all respects similar to each other, except 

 that the tail of the female is just beginning to change from the 

 bleached pelage to the fresh coat of the bi-eeding season. On the 

 body the change is completed. The anuulations on the hairs of the 

 back are moi-e dititinct in the female than in the male, but the latter 

 has the more noticeable sprinkling of whitish hairs over the lumbar 

 region. 



Soiurus vittatus Raffles. 



Two skins from Linga Island, four froni Sinkep Island, and six 

 from the Indragiri river, Sumatra. The Sinkep specimens are 

 slightly paler than the others, and the black lateral stripe is a little 

 less well defined. The characters, however, are too inconstant to 

 be regarded as of much importance.' 



Sciurus tenuis Raffles. 



An adult male and female from the Indragiri river, Sumatra. 

 They are in every respect indistinguishable from the Singapore 

 animal. 



Sciurus melanops sp. nov. 



Type. — Adult female (skin and .skull). No. 118,152 United 

 States National Musuem. Collected on Indragiri river, eastern 

 Sumatra, September 15, 1901, by Dr. W. Jj. Abbott. Original 

 number 1,807. 



Characters. — A member of the ;S'. /;rew>.s^it group. Color exactly 

 as in S. humei (Bonhote), except that the cheeks are black, 

 scarcely grizzled with gray. 



Color. — Tail and entire dorsal surface of head and body clear 

 shining black. Cheeks and sides of neck lilack, but the color 

 dulled by a very faint admixture of gray and rod. This grizzling 



