400 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.38. 



color, the general effect a yellowish smoke-gray; line of demarcation 

 rather evident ; feel like underparts but with a decided tinge of broc- 

 coli-brown; tail uniform dark brown, the minute hairs with which it 

 is sprinkled brownish or silvery according to light. 



Skull. — The skull is robust and heavily built, its size and general 

 outline when viewed from above much as in Thomas's figure of Car- 

 pomys />/<•■' urns." but zygomata less widely spreading, outer wall of 

 antorbital foramen so greatly developed that orifice is more conspicu- 

 ous in dorsal view than when skull is seen from in front; margin of 

 interorbital region conspicuously but narrowly beaded, the ridge con- 

 tinued backward to about middle of parietal, where it abruptly dis- 

 appears. In lateral view the resemblance to Carpomys pTi&urus is 

 I,-- evident, as the depth at anterior base of zygoma is relatively much 

 greater, so that the dorsal profile is evenly convex; the very wide outer 

 wa ll of antorbital foramen is also conspicuous in this view: lower por- 

 tion of anterior border of this plate vertical, upper portion strongly 

 convex. Palate much narrower between anterior molars than pos- 

 teriorly; incisive foraminse long and narrow, their hinder border 

 extending to level of anterior root of m 1 ; posterior border of palate 

 at level of posterior margin of alveoli, its median region partly isolated 

 by two lateral perforations, the resulting form superficially resem- 

 bling that in certain Microtime; audita! bullae moderate, evenly 

 inflated. Mandible deep and short, the coronoid process rising 

 uoticeably above condyle. 



Teeth. -The teeth in the single known specimen are too worn to 

 show the details of enamel folding. Apparently they do not differ 

 essentially from those of members of the Epimys rattus group. Upper 

 tooth row- strongly converging anteriorly. 



Measurements. Type: Head and body. 174 mm.; tail, lot); hind 

 foot (dry), 33; skull, condylobasal length, 37.2; zygomatic breadth. 

 20.4; interorbital constriction, 5.2; mastoid breadth, 15.0; depth of 

 brain case at middle, 13.0; nasal, 15.2; diastema, 10.4: mandible. 24.0; 

 maxillary toothrow (alveoli), 7.(>; mandibular toothrow (alveoli), 7.<i. 



BATOMYS DENTATUS, new species. 



Plate 20. 



Type-specimen. -Adult male (skin and skull) Cat. No. 151506, 

 U.S.N. M. Collected at I la ight s-in-t he-( )aks, Benguet, Luzon (alti- 

 tude 7,i)()i) feet), July 31, 1907, by Dr. Edgar A. Mearns. Original 

 number 6 IM . 



Diagnosis. Size and general appearance as in Batomys <jr<ii//i 

 Thomas, but under parts more bully and terminal half of tail white; 

 no bare area around eye; skull with much deeper brain case than in 



the relate. I species; CTOWnS of Upper molar- fully a- wide a- palate. 



— ■ 



"Trans. Zool. Soc. London, vol. 14, pi. -U, fig. 7. 



