A FOURTH COLLECTION OF SIAMESE MAMMALS. 59 
15. Sciurus atrodorsalis thai. 
: Kloss, Journ. N. H. S Siam, II, p. 285 (1917). 
1 2 ad., 1 ¢ ad., from Sikawtur, N. W. of Raheng, W. Siam, 
1500 ft. [ Nos. 2646,7/CBK.] Collected by Mr. K.G. Gairdner, 
3 Feb. and 16 May 1917. Orig. Nos. 350, 427. 
These two specimens differ from the type series in having the 
muzzles more buffy than ochraceous, and the ears and the ring round 
the eyes paler. One is similar below but the other has the throat and 
foreneck grey and the chest yellow, while the middle abdomen is 
suffused with yellow and there are stripes of the same colour on the 
front of the hind legs between the grizzled and rufous areas ; its tail 
is a deeper buff distally. A trace of yellow is also present on the 
chest of an animal of the typical series. 
The type female, though an adult with worn teeth, is a little 
below the average in size. 
(For measurements see table postec). 
16. Sciurus nox WRovuGHTON. 
Kloss, Journ, N. H. S. Siam, IT, p. 17 (1916). 
2 3 ad. from Nong Khor near Sriracha, 8S. EK. Siam [Nos. 
2520,1/CBK.] Obtained by Mr. W. J. F. Williamson’s collector on 
13 and 14 July, 1916. 
Practically topotypes of the jet-black Siamese squirrel. No 
measurements have been recorded in the field and the skulls have been 
damaged by cutting away the backs. 
17. Sciurus bocourti bocourti M-Epw. 
Kloss, Journ. N. H. 8S. Siam, II, pp. 17, 8309 (1916-7). 
1d ad. from Bang Pa In near Ayuthia, Central Siam [No. 2678/ 
CBK.]. Collected by Dr. Malcolm Smith. 1 Feb. 1918. 
Above a grizzle of black and buff, warmest on the nape, darkest 
on rump and tail. Ears, top and sides of muzzle, cheeks and above 
eyes, sides of neck, sides of forelimbs and upper surface of forearms, 
lower sides and ankles white; fore and hind feet greyish. Hntire 
under parts including base of tail white. Tail above coarsely grizzled 
black and buff with numerous white hairs, below pale greyish. 
(For measurements see table postea ). 
VOL, III, NO. IJ, 1918, 
