no. 1809. MAMMALS FROM BORNEO AND VICINITY— LYON. 87 



SCIURUS SIRIENSIS, new species. 



Type.— Skin and skull of adult male, Cat. No. 151768, U.S.N.M., 

 collected on Pulo Mata Siri, Java Sea, December 7, 1907, by Dr. W. L. 

 Abbott. Original number, 5580. 



Diagnostic characters. — A very pale form of the "red" footed, "red" 

 bellied Sciurus vittatus group of squirrels, generally similar to S. 

 lautensis Miller, 1 but slightly more pallid, and with larger audital 

 bullae. 



Color. — Upper parts of body a fine grizzle of cream-buff and 

 blackish, the cream-buff being in excess; tail both above and below 

 similar, but the grizzle much coarser; under parts, including throat 

 and inner side of fore and hind legs, pale ochraceous buff; light 

 side stripe (17 by 60 mm.) whitish cream color; dark side stripe 

 about the same length and width, dull pale blackish; top of head a 

 grizzle of buffy and blackish, the former in excess; sides of head gen- 

 erally buffy; outside of hind legs similar in color to back; outside of 

 forelegs similar to adjoining parts of body, but more buffy; fore 

 and hind feet generally buffy to ochraceous buffy; ears similar to 

 adjoining parts of body; whiskers black. 



Skull and teeth. — These show no special peculiarities and very 

 closely resemble those of Sciurus lautensis. The bullae, however, are 

 distinctly larger in S. sinensis, so that the two species are easily 

 distinguished. 



Measurements. — See table, page 90. 



Specimens examined. — Six, all from Pulo Mata Siri. 



Remarks. — The occurrence of two species so closely resembling each 

 other as Sciurus lautensis and S. sinensis on islands of opposite coasts 

 of Borneo is interesting. It is probably the result of similar envi- 

 ronments, but I have been unable to find any details concerning the 

 conditions on the two islands. 



SCIURUS ARENDSIS, new species. 



Type.— Skin and skull of adult male, Cat. No. 154276, U.S.N.M., 

 collected on Arends Island, Java Sea, November 24, 1908, by Dr. 

 W. L. Abbott. Original number, 6251. 



Diagnostic characters. — A member of the Sciurus vittatus group of 

 squirrels, distinguished by its small size, light under parts, and 

 whitish axillary hairs; rather closely related to its geographic 

 neighbor, Sciurus sinensis, from Pulo Mata Siri (see above), but 

 smaller, with more whitish hairs on under parts, and with darker 

 upper parts. 



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

 surfaces of fore and hind legs and upper surface of feet, a fine grizzle 



i Proc. Wash. Acad. Sci., vol. 3, p. 128, March 26, 1901, Pulo Laut. Natuna Islands. 



