232 MR. O, THOMAS ON THE [Apr. 16, 
millim. in S. melanotis, the latter an animal with the cranial part of 
the skull as large as, if not larger than, that of 8. whiteheadi. 
Teeth :—incisors narrow, strongly convex in front, orange above, 
nearly white below ; premolars4, the anterior upper minute, circular 
in section. 
Dimensions of specimen e, an adult male in spirit :—Head and 
body 84 millim. ; tail, without hairs 67, with hairs 98; hind foot 
25°7; ear, without hairs 10-0, with hairs 26; head 29-3; tip of 
muzzle to eye 18, to ear 24; forearm and hand 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. evilis, S. melanotis, and a species only 
recently described by myself, namely S. concinnus ; the latter species 
comes from the Philippines, but the other two, like S. whzteheadi, 
both occur in Borneo, which possesses therefore three of the four 
members of the group. Of these species, S. whiteheadi is evidently 
most nearly allied to S. evilis, 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 appareutly gnawing at their bark. Its 
position in the figure (Plate XXIV.) is copied from a sketch made by 
Mr. Whitehead from the livi ying animal. 
13. Mus Inrratuteus, Thos. Ann. Mag. N. H. (6) ii. p. 409 
(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. 
