MAMMALS COLLECTED IN SIMA. 367 
orange-buff not extending to the tip. The black-backed specimén, 
which is the type, has this suffusion to a less degree. 
When first obtained the small size of this squirrel obscured 
its relationship, but towards the end of my visit the black-backed 
specimen was collected and this development appears to indicate an 
undoubted affinity with alrodorsalis. In colour the race more 
nearly resembles the large S. a. zimmeensis (Rob. & Wr.) of 
North Siam! and S. a. shanicus Ryley, of the Shan States,2 than 
the geographically nearer typical form of Moulmein or S. a. thai 
mihi, from Raheng.* 
Two specimens collected in May by Dr. Malcolm Smith do 
sth differ from examples taken in November. 
Type. Adult female (skin and skull). No. 2213/C. B. K. 
Collected at Pak Bu, Tachin, Central Siam on 23rd October, 1916. 
| (For measurements see table postea) 
26. Sciurus nox. 
Sciurus nox, Wroughton, Aun. & Mag. Nat. Hist. (8) II, p. 396 
(1908); Kloss, Journ. Nat. Hist. Soc. Siam, I, p. 227 (1915); 
id., Op. 16, 10, p. ET (916). 
13d ad. 32 ad. Satahip, near Cape Liant. 
The types of this species came from Sriracha on the east 
coast of the Inner Gulf of Siam about 30 miles S. E. of the Chao Phya 
river mouth, and it remained unknown elsewhere until I received 
specimens from Hup Bon and Nong Khor, a few miles inland. It 
would thus appear to have a very small range and to be practically 
confined to a triangular piece of country of which Cape Liant is the 
apex. } 
It is a very stable animal, always entirely black, and shows 
no tenlency to intergrade with any other form. Its nearest relation 
seems to be S. albivexilli mihi, from Koh Kut; Chantabun Archi- 
pelago, which only differs in the possession of a white tail-tip, rather 
shorter tail and hind foot and slightly larger skull. 
1. Journ. Fed. Malay States Museums, VII, p. 91 (1916). 
2. Journ. Bombay Nat. Hist. Suc. XXIT, p. 663.( 1913) 
3. Journ. Nat. Hist. Soc. Siam, II. p. 285 (1917). 
VOL. III, NO. 4, 1919. 
