no. 1809. 'MAMMALS FROM BORNEO AND VICINITY— LYON. 99 



unable to see that a series from one island differs as a whole from a 

 series from another island. On the basis of measurements of the 

 hind feet and the maxillary tooth row these rats may be separated 

 into three groups: A group with small feet and small teeth charac- 

 teristic of the specimens from the mainland and from the small and 

 close-lying islands of Junata and Bauwal. Those are here considered 

 as typical Epimys neglectus. They agree closely with Jentink's 

 measurements of the type. A group with small feet and large teeth, 

 embracing the specimens from Pulos Panebangan, Lamukotan, and 

 Mata Siri. A group with large feet and large teeth from Pulos Pelapis 

 and Datu. Each of the last two groups are described below as 

 subspecies of Epimys neglectus. They are not well marked forms and 

 without a series of specimens it would be impossible to identify them, 

 but they present average differences in size which can not be disre- 

 garded. It should be noted that the islands in geographic relation 

 to each other, Pelapis and Panebangan, and Datu and Lamukotan 

 are not in relation to each other so far as the forms of neglectus rats 

 are concerned. 



EPIMYS NEGLECTUS DUCIS, new subspecies. 



Type. — Skin and skull of adult male, Cat. No. 145511, collected on 

 Pulo Datu, off west coast of Borneo, May 4, 1907, by Dr. W. L. 

 Abbott. Original number, 5174. 



Diagnostic characters. — A form of Epimys neglectus Jentink charac- 

 terized by longer hind feet and longer maxillary tooth row. 



Distribution. — The islands of Pelapis and Datu off the west coast 

 of Borneo. 



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

 mixture of blackish brown and a color between ochraceous buff and 

 clay color, the blackish brown slightly in excess; under parts, cream 

 buff, more or less dirty; outer sides of legs, similar to upper parts, 

 inner sides, similar to under parts; tail light brownish; scantily haired, 

 3 brownish hairs to a scale, and each hair about the length of 1 h, scales; 

 outside of ears with short brownish hairs, inside with light dull 

 buffy hairs. 



Pelage.— Pelage of the back is composed of (1) rather long slender 

 hairs, slaty at the base with a conspicuous ochraceous-buff-clay 

 colored subterminal band, and a small dark brownish tip; (2) less 

 numerous flattened, grooved bristles, somewhat spine-like, but not 

 stiff enough for true spines, colored light grayish basally, and with a 

 conspicuous brownish tip; (3) a few long slender bristles nearly twice 

 the length of the grooved bristles, uniformly dark brownish in color. 



Skull and teeth. — These are of the same general form and size as in 

 the alexandrinus-rattus group of rats. The maxillary tooth row 

 averages longer, from about 7 to 7.7 mm., than it does in typical 

 Mus neglectus, about 6.5 to 7. 



