530 On a special Mountain Race of the Plantain Squirrel. 



vening altitude (2000 feet) prevents my distinguishing the 

 animal as more than a subspecies. 



Its original discoverer was probably Mr. John Whitehead, 

 who obtained what is perhaps the same form on Mount Kina 

 Balu; but unfortunately his only adult specimen has an 

 imperfect skull, so that I am unable to be quite certain as to 

 its identity with that from Dulit. In any case it seems better 

 to be on the safe side by describing the form of which good 

 material is available, leaving the identity of its Kina Balu 

 representative to be settled later, 



Sciurus notatus oresteSy subsp. n. 



Size very much less than in the typical form. Markings 

 similar to those of ordinary blue-bellied specimens of 8. notatus, 

 without any trace of rufous or orange on the belly. Sides 

 with the usual lines of black and white. Back with a peculiar 

 buffy or dull fulvous shade, due to the light rings on the 

 hairs, ordinarily pale yellow, being deep buff. Cheeks and 

 sides of muzzle less fulvous than the back, instead of more 

 so. A small patch behind each ear white. Tail witli shorter 

 hairs, and these more broadly ringed than usual, so that there 

 is an indistinct barring of the tail, instead of its being merely 

 grizzled. 



Skull conspicuously smaller than in lowland specimens, so 

 much so that it seems difficult to assign both to the same 

 species. In proportion also it is broader and more rounded, 

 the muzzle shorter, and the bullae and postorbital processes 

 are less developed. 



Dimensions of the type (a well-made skin, ? ) : — 



Head and body 195 millim. ; tail 144 ; hind foot 33-3. 



Skull (of another specimen) : greatest length 39*7 ; greatest 

 breadth 25; nasals, length 11, greatest breadth 5-9; inter- 

 orbital breadth 14*7 ; diastema 9 ; length of upper molar 

 series exclusive of^.^ 6*1. 



Hab. Mount Dulit, 4000 feet. 



Type : B.M. 94.6.2.24. Collected January 1892, and pre- 

 sented to the Museum by Messrs. Charles and Ernest Hose. 



The intermediate specimen above referred to, from 2000 feet, 

 has a wash of rufous on the belly and a skull-length of 

 44 millim., while the normal lowland form, which in Borneo 

 seems always to have an orange or rufous belly, has a skull- 

 length of about 50 millim. It is noteworthy that the belly- 



