346 On some neio Bornean Mammalia. 



Mus MargaretUe^ sp. n. 



Size, form, and general appearance very much as in Van- 

 deleuria oleraceo. Whiskers numerous and prominent, 

 black. Ears small, oval, practically naked. Colour, so far 

 as can be made out in a specimen in spirit, deep rufous 

 chestnut, mixed on the back with the grey of the bases of the 

 haiis, but clearing on the sides, where it seems to form a 

 rufous lateral band. Chin, chest, and belly white. Hands 

 and feet also white, but the metapodials with darker 

 median patches. Thumbs prominent, opposable, with a large 

 nail; claws of fingers short and curved. Hallux also oppo- 

 sable, its claw reduced to a minute conical point, not sur- 

 passing in length the pad below it ; other toes all with their 

 claws very short and curved, and surpassed in length by the 

 prominent terminal pads. Soles naked, with six large rounded 

 pads. Tail very long, slender, finely haired, almost naked ; 

 scales very small, averaging about seventeen to the centi- 

 metre, their colour a sort of pale greenish grey, the same 

 above as below. Mammae 1 — 2 = 6. Palate-ridges 3 — 5. 



Skull with a very peculiar and noteworthy resemblance to 

 that of Chiropodomys^ agreeing with that of Gh. gliroides so 

 closely that it is not until a close examination is made that 

 the differences become apparent. General proportions short 

 and broad, the brain-case especially broad and rounded. 

 Interorbital space flat, its edges sliarply beaded, converging 

 strongly forwards. Interparietal very large, its anterior edge 

 nearly directly transverse, its posterior one boldly bowed out 

 backwards. Anteorbital plate of zygoma not projected 

 forwards at all. Anterior palatine foramina very small and 

 narrow. Molars of very much the rounded shape and 

 general proportions of those of Chiropodomys, but their struc- 

 ture as in Mus. 



Dimensions of the type (an adult female in alcohol) : — 



Head and body 76 millim. ; tail 144 ; hind foot 19'7 ; ear, 

 above head 11, from notch 13 ; length of liead 28. 



Skull: basal length 21'5; upper lengtli 25' 5 ; zygomatic 

 breadth 13 ; breadth of brain-case 12*2 ; nasals, length 7*6 ; 

 interorbital breadth 4*1 ; interparietal, length 4'2, breadth 9; 

 anterior zygoma-root 2 3 ; palate, length 13 ; diastema 6'8 ; 

 anterior palatine foramina 3*6; length of upper molar 

 series 3 "7. 



Hah. Penrisen Hills, Sarawak. Coll. A. Everett, June 

 1892. 



This very remarkable species will no doubt need in the 

 future the erection of a special genus or subgenus for its 



