Sciurus notatus and allied Species. 453 
Malay Peninsula, and can find no characters which would 
justify their division into geographical races. 
With regard to considering this form as a distinct species, 
a few words may not be out of place. As it occurs in so 
many places in company with S, vittatus, it must clearly be 
considered either a dimorphic form or a separate species. 
Although in S. vittatus all shades of rufous colour may be 
found, in S. nigrovittatus the colour is always constant, and 
there are no intermediate forms between the two species as 
one would expect were it a dimorphic form or geographic 
race. ‘The next point to be noticed is that its distribution is 
not the same; it occurs in Java, where the red-bellied form 
is unknown, and this is also the case, as Mr. Miller has 
shown, on an island in the South China Sea. This last 
instance also tends to disprove the supposition that S. nigvo- 
vittatus 1s a mountain form, as none of the China Sea islands 
rise to any great height; and in furtherance of this statement 
it may be noticed that the red-bellied species occurs at a 
considerable height on the mountains of Perak. 
Sciurus nigrovittatus orestes, Thos. 
Sciurus notatus orestes, Thos. Ann, & Mag. Nat. Hist. ser. 6, vol. xv. 
p. 529 (1895). 
Differs from S. nigrovittatus typicus in its smaller size, 
more rufous coloration on the back, absence of the brown 
colour on the cheeks and chin, and in the tail being thinner 
and more sparsely clad and ending in a black pencil. ‘The 
general colour of the back and upper parts is as in S. nigro- 
vittatus, but the annulations are much broader and more 
rufous (ochraceous rufous, Ridg.). The cheeks and sides of 
the face are very pale fulvous tinged with grey; the chin is 
bluish grey like the underparts, but with slight traces of 
fulvous. ‘There is a tendency to a fulvous ring roand the 
eye, and the light patch behind the ears is conspicuous. 
The tail resembles the back, but the annulations are light 
and conspicuous; the tip is black. 
Skull—Except in size the skull presents no marked 
features by which it might be distinguished trom the typical 
race. ‘lhe rostrum is slightly broader in proportion and the 
nasals do not taper quite so much posteriorly. 
Dimensions (type, after Thomas) :—Head and body 196 
millim.; tail 144; hind foot 33°3. 
Skull: greatest length 39:7 ; zygomatic breadth 25 ; inter- 
orbital breadth 14°7 ; length of nasals 11; greatest breadth 
of nasals 5°9, post. 4°2, 
