168 Lyon — Descriptions of Four New Treeshrcws. 



zygomata, 19.19; maxillary toothrow, alveoli, 17.5, 18; width of rostrum 

 back of incisors, 7, 6.5. 



Specimens examined. — Two. the type and Cat. Xo. 104,354, U. S. X. M., 

 from Pulo Adang, Butang Islands. 



Tupaia pemangilis sp. nov. 



Type.— Skin and skull, adult female, Cat. No. 112,499, U. S. N. M., 

 Pulo Pemangil, east coast Malay Peninsula, June 12, 1901, Dr. W. L. 

 Abbott, Orig. No. 1064. 



Diagnostic characters. — A member oi the ferruginea group closely" related 

 to T. sordida from Tioman, but slightly duller in color, with slightly 

 grayer feet, and with anterior portion of underparts more buffy, much 

 like that of T. pulonis from Pulo Aor. ; skull like that of sordida, but 

 slightly narrower, and with m 3 rather smaller. 



Cotor. — Type: Upper parts a grizzle of dull tawny ochraceous and 

 blackish, brightest on posterior parts of body, and lightening anteriorly 

 on neck and head to a grizzle of raw sienna (or gallstone yellow) and 

 blackish; outer side of forelegs like top of neck; outerside of hindlegs, 

 like lower hack; shoulder stripe moderately conspicuous, between bun 

 and olive buff; throat and chest pale dull buffy; inner sides of legs dull 

 buffy with darker bases of the hairs showing through; tail above a 

 uniform grizzle of cream color and blackish, both colors about equally 

 prominent; below a coarse grizzle of dull buff and black, the buff color 

 predominating along central line ; hands and feet a fine grizzle of the 

 colors of the adjacent parts. 



Skull and teeth. — Very similar to those of Tupaia, sordida from the 

 nearby Pulo Tioman, but skull slenderer, and with to 3 rather smaller, and 

 with slightly smaller bullae. 



Measurements. — Type and the type of Tupaia sordida. Cat. Xo. 101,747, 

 U. S. X. M.: Head and body, 185, 171; tail, 150, 165; hindfoot (dry), 

 40, 41 ; condylobasal length of skull, 45, 46; zygomatic width, 23, 25.5; 

 width of braincase above roots of zygomata, 19, 20; maxillary toothrow, 

 alveoli, 17.5, 18.5. 



Specimens examined. — One, the type. 



Remarks. — Tupaia pemangilis is only a slightly differentiated form, and 

 were it not for its insular isolation could not he considered more than a 

 subspecies. It is most closely related to T. sordida of Pulo Tioman and 

 is not distantly removed from T. pulonis of Pulo Aor. The three islands 

 Aor, Tioman, and Pemangil are thus inhabited by Tupaias of the ferru- 

 ginea group differing slightly from each other and as a whole from the 

 mainland form. 



Tupaia natunae sp. nov. 



Type. — Skin and skull of rather old adult female, Cat. Xo. 104,714, 

 U. S. X. M., collected on Bunguran, Xatuna Islands, June 27, 1900, by 

 Dr. W. L. Abbott, Orig. No. 514, 



