no. 1757. NEW PHILIPPINE MAMMALS— MILLER. 401 



External characters. — General external features agreeing with the 

 description and figure of Batomys granti, except that the region 

 immediately surrounding eye is normally furred, and the hairy cover- 

 ing of tail is so thin that the annnlat ions are plainly visible (about 

 12 to the centimeter at middle). 



Color . — Entire upper parts a uniform light-brown, slightly more 

 yellow than the wood-brown of Ridgway, the face tinged with drab, 

 the lumbar region and rump with russet, the entire area finely and 

 inconspicuously varied by the blackish tips to the longer hairs and 

 subterminal annulations on those of under fur; sides and flanks 

 suffused with ochraceous buff, this color covering the entire under 

 parts, except chin and throat, which are a pale cream-buff much 

 darkened by the slate-gray under color; the general effect in this 

 region a dull buffy drab; feet a dull huffy gray, the metapodials 

 clouded with sepia; ears an indefinite dark brown; whiskers black, 

 tail a uniform blackish brown through a little more than basal half, 

 then abruptly white to tip. 



STcuU. — The skull of Batomys dentatus is about the same size and 

 general form as that of B. granti, the dorsal and ventral views agree- 

 ing in all important characters with the figures published by Thomas." 

 In lateral view, however, it differs conspicuously in the greater depth 

 of brain case over front of parietals and the much more marked angle 

 at which the posterior portion slopes toward the low occiput; depth 

 at posterior margin of alveolar of m 3 contained about three times in 

 condylobasal length instead of 3h times as in B. granti. 



Teeth. — The disproportionately large teeth of Batomys dentatus is 

 the most conspicuous feature of ventral aspect of skull. The width 

 of crowns slightly exceeds that of palate at its narrowest point, while 

 the length of tooth row measured along alveoli exceeds distance from 

 alveolus of m l to front of incisive foramen by about 1.5 mm. (in B. 

 granti it falls short of anterior extremity of foramen by about the 

 same distance). The teeth of the type of B. dentatus are less worn 

 than those of the type of B. granti, but allowance being made for this 

 fact, the enamel pattern seems to be alike in the two animals. The 

 actual differences are as follows: m 1 : second and third laminae com- 

 pletely separated, each with a well defined reentrant angle on ante- 

 rior margin, partly isolating a small inner tubercle, this angle rather 

 better defined than that of first lamina as figured by Thomas; m 2 : 

 antero-internal tubercle distinct, not indicated by an enamel island 

 as in the figure of B. granti; second and third lamina' separate and 

 of essentially the same form as in the preceding tooth; m 3 : elements 

 as in ///'-' and equally distinct, but inner tubercles of second and third 

 lamina) less well defined (the reentrant angles shallower), and median 

 lobe narrower; m l with three transverse laminae, the second and third 



"Trans. Zool. Soc. London, vol. 14, pi. 36, fig. 8. 

 Proc . N . M . vol . 38—10 26 



