232 MR. o. THOMAS ON THE [Apr. 16, 



millim. iii S. melanotis, the latter an animal with the cranial part of 

 the skull as large as, if not larger than, that of S. whiteheadi. 



Teeth : — incisors narrow, strongly convex in front, orange above, 



nearly white below ; premolars -p the anterior upper minute, circular 



in section. 



Dimensions of specimen c, an adult male in spirit : — Head and 

 body 84 miUim. ; tail, without hairs 67, with hairs 98 ; hind foot 

 257; ear, without hairs lO'O, with hairs 26; head 29'3 ; tip of 

 muzzle to eye 18, to ear 24 ; forearm and baud 36'5; heel to front 

 of last foot-pad 12'3 ; hairy part of sole in centre line 9*4. 



This very beautiful little Squirrel is perhaps the most attractive 

 of all the new Kina Balu mammals. It belongs to a group of pigmy 

 squirrels, consisting of S. exilis, S. melanotis, and a species only 

 recently described by myself, namely S. concinmts ; the latter species 

 comes from the Philippines, but the other two, like S. whiteheadi, 

 both occur in Borneo, which possesses therefore three of the four 

 members of the group. Of these species, S. whiteheadi is evidently 

 most nearly aUied to S. exilis, but it is readily distinguishable from 

 that, as from all the others, by its beautiful elongated ear-tufts, 

 which, in proportion to its size, are probably longer than those of 

 any other known Squirrel, not even excepting Rheithrosciurus 

 macrotis. 



Mr. Whitehead informs me that this little Squirrel may often be 

 seen on the upper slopes of Kina Balu running up and down the 

 trunks of the trees, and apparently gnawing at their bark. Its 

 position in the figure (Plate XXIV.) is copied from a sketch made by 

 Mr. "Whitehead from the living animal. 



13. Mus iNFRALUTEUs, Thos. Ann. Mag, N. H. (6) ii. p. 4U'J 

 (1888). 



a. 3000 feet. 22/3/88. Type. 



Size large. Fur coarse and harsh, but not spinous. General 

 colour dark greyish brown, the tips of the shorter hairs with a silvery 

 lustre. The longer straighter hairs numerous, not markedly length- 

 ened on the rump, uniformly black. Under surface a dirty yellowish 

 brown, the tips of the straighter hairs dull orange, their base and the 

 whole of the under-fur slaty grey. Ears small and rounded, naked. 

 Hands and feet brown ; last hind foot-pad elongate. Tail rather 

 shorter than the head and body, thinly haired, dark brown above 

 and below ; rings of scales averaging about 8 or 9 to the centimetre. 

 Skull stout and heavily built. Supraorbital edges strongly ridged. 

 Anterior edge of outer wall of infraorbital foramen evenly convex 

 forwards. Palatine foramen about equal in length to the two anterior 

 molars together, not reaching backwards to the front of m\ 



Teeth powerful ; incisors broad, dark yellow in front above and 

 below. 



Dimensions : — Head and body (c.) 285 millim. ; tail (extreme tip 

 wanting) 235; hind foot 51 ; heel to front of last foot-pad 26; 

 length of the same pad 9 '3. 



