Bornean Species of the Genus Mus. 457 



Mus Whiteheadi. 



Size small. Fur of medium length, thickly mixed with 

 spines. General colour above tawny rufous, lined with black ; 

 the spines slaty white, with black tips. Under surface 

 ochraceous, more or less pure according to the degree to 

 which the slaty bases of the hair are visible. Ventral spines 

 white-tipped. Sides paler, no sharp line of demarcation be- 

 tween the upper and lower colours, which are, indeed, except 

 for the black tipping of the dorsal spines, very like each 

 other. Ears of medium length, laid forward in a spirit- 

 specimen they reach about to the middle of the eye ; naked. 

 Upper surfaces of hands and feet white or pale buff; palms 

 white, soles slaty blue ; fifth hind toe reaching nearly to the 

 middle of the first phalanx of the fourth ; sole-pads usually 

 only five in number, the postero- external being suppressed in 

 all but two of the specimens examined. Tail scarcely longer 

 than head and body ; very finely haired, practically naked, 

 not pencilled at tip ; bicolor, slate-coloured above, white 

 below. Palate-ridges 3 — 5; maininse 2 — 2 = 8. 



Skull : interorbital region broad, with strong supraorbital 

 ledges, which, after forming a sharp postorbital angle, run 

 back along the parietals. Anterior margin of interparietal 

 nearly directly transverse. Projecting plate of anterior 

 zygoma-root well developed, convex above. Anterior palatine 

 foramina just about the length of the upper molar series, but 

 sometimes rather shorter, not quite reaching to the level of 

 the front side of 5Li ; their combined outlines forming a long 

 even oval. 



Hind foot of the typical skin ( ? ), moistened, 27 millitn. 



Dimensions of a specimen in spirit ( $ ) : — 



Head and body 102 millim. ; tail 110; hind foot 27; 

 ear 15 - 5 x 13 ; heel to front of last foot-pad 13. 



Skull : see p. 459. 



Hab. Mount Kina Balu. 



Type obtained by J. B. Whitehead at 3000 feet, March 18, 

 1888. 



This species is that referred to in my own previous papers 

 and in Hose's l Mammals of Borneo ' as Mus Musschenbroeki, 

 Jent. ; but a renewed comparison of it with my notes on 

 Dr. Jentink's type in the Leyden Museum shows that the 

 Celebean species is a larger animal with, among other differ- 

 ences, a molar length of 6*1 millim. and a hind foot of 

 30 millim. The palatal foramina are also markedly longer. 



Ann. & Mag. N. Hist. Ser. 6. Vol. xiv. 32 



