Mammals from Northern Luzon. 161 
CHROTOMYS, gen. nov. 
Structure of teeth as in Hydromys, but molars 3 in number. 
Skull intermediate between Hydromys and Xeromys. 
Form Murine, as in the last-named. Mamma 0—2=4. 
Chrotomys Whiteheadt, sp. n. 
Size of Mus rattus. Fur soft and thick. Ground-colour 
grey-brown, tending in some specimens to rufous; a well- 
defined bright buff or orange line extending from the middle 
of the face nearly to the root of the tail, shown up on each 
side by a broad shining black band. Under surface slaty 
buff, not sharply defined. Metapodials shining grey; digits 
white. Tail shorter than head and body, thinly haired, 
blackish above, rather paler below. 
Dimensions of type (¢) :— 
Head and body 196 millim.; tail 111; hind foot (moist- 
ened) 35. 
Skull: basal length 38; greatest breadth 21-7 ; length of 
upper molar series 5°1. 
Xeromys (?) stlaceus, sp. n. 
General appearance very similar to that of Rkynchomys 
soricoides, to which there 1s really no relationship whatever, 
the real alliance being with Chrotomys. Size of a small rat. 
Fur soft, close and velvety. Colour uniform slaty grey, very 
finely grizzled with whitish. Belly but little paler, with a 
buffy tinge. ars and feet like body. ‘Tail short, very 
thinly haired, brown above basally, whitish below and at the 
tip. Skull very similar in form and structure to that of 
Chrotomys Whiteheadt, although rather smaller; but there are 
only two molars, as in Xeromys, to which the species is pro- 
visionally referred. 
Dimensions of type ( 6) :— 
Head and body (probably rather stretched) 195 millim. ; 
tail 110; hind foot (moistened) 33:4. 
Skull: basal length 34; greatest breadth 19; length of 
the two upper molars 4. 
CARPOMYS, gen. nov. 
Form more or less Myoxine. Fur thick and woolly. 
Pollex with a large nail. Tail long, well-haired. Mammez 
0—2=4. 
Skull with a large rounded brain-case and short face. 
Ann. & Mag. N. Hist. Ser. 6. Vol. xvi. iL 
