FROM THE PHILIPPINE ISLANDS. 391 



The suppression of m.^ in Cehenomys is an interesting sign of its relationship to the 

 Australian members of the subfamily, Ilydromys and Xeromys, both of which have only 

 two molars, while the other two Philippine genera, Chrotomys and Grunomys, have the 

 normal Murine number of tiiree molars. 



CEL.ENOMYS SILACEUS (Thos.) (Plate XXXI. fig. 1.) 

 Xeromys {?) silaceus Thos. Ann. Mag. N. H. (6) xvi. p. 161 (1895). 



a, b. Monte Data, Feb. 1895. 



Size of a common Rat. Fur soft, close and velvety, hairs on posterior back about 

 10-12 millim. in length. General colour uniform slaty grey, very finely grizzled with 

 whitish, but so finely as scarcely to affect the general grey tone. Sides of muzzle nearly 

 black. Under surface rather paler than the back, not sharply defined, the hairs slaty 

 grey basally, washed with huffy white terminally. Eyes small, not black-ringed. Ears 

 short, uniform greyish. Hands and feet as far as the metapodials dark grey, the 

 digits whitish or flesh-coloured. Tail rather shorter than the body without the head, 

 thinly haired, brown above basally, whitish below and at the tip. 



Skull as already described. 



Dimensions of the type ( 6 ) taken in skin : — 



Head and body (probably rather stretched) 195 millim.; tail 110; hind foot 

 (moistened) 33'4. 



Skull, see p. 395. 



Hah. Monte Data, Lepanto, N. Luzon, 8000 feet. 



" This curious Mammal at first sight might easily be confounded with Rhynchomys 

 soricoides, and, like that animal, was also obtained on the table-topped summit of 

 Monte Data. It seems rare, only two specimens having been snared in some five weeks. 

 The skull and teeth, instead of being frail as in Wiynchomys, are powerful, and much 

 more nearly allied to Chrotomys. The eye is small as in Bhynchomys, and the outward 

 appearance quite as Shrew-like. The habits of this peculiar Mammal I am quite 

 unable even to guess at. 



" Distribution. High mountains of Central Northern Luzon." — J. W. 



Chrotomys. 

 Chrotomys Thos. Ann. Mag. N. H. (6) svi. (1895) p. 161. 



Colour abnormal among Muridee, the back prominently striped. Form suited for a 

 terrestrial, not aquatic life. Size about as in the common Rat. Fur soft and straight. 

 Muzzle apparently not cleft. Eyes rather small. Ears well developed. Tail rather 

 short, thinly haired, scaly. PoUex with a rounded nail ; other digits, including hallu.x, 

 with well-developed, little-curved claws. 



