182 On a new Monkey and a new Squirrel. 
Dimensions of the type :— 
Head and body 485 mm.; tail 845; hind foot 162 ; 
ear 45. 
Skull: greatest length 101; condylo-basal length 79 ; 
zygomatic breadth 77 ; nasal opening 19 x 10; orbit 21 x 23; 
interorbital space 10; breadth of brain-case 59; basal 
diameter of canine 8; upper cheek-teeth 26:5; molars 
only 19. 
Hab. Ban Na Sao, S.W. French Laos, on the French side 
of the Mekong, in latitude about 17° 30! N. 
Type. Adult male. B.M.no. 20.12.10.1. Original num- 
ber 7213. Collected 24th February, 1920, and presented to 
the National Museum by Herbert C. Robinson and C. Boden 
Kloss. One specimen only examined, but two more, quite 
similar, were obtained and are now in Kuala Lumpur. 
By its wholly black body-colour this fine monkey is distin- 
guished from any of the genus except P. francois: *, which 
is undoubtedly its nearest ally; but from this it differs by 
having nearly the whole head white, while in that animal the 
white is confined to two narrow lines running along the sides 
of the face. 
In P. poliocephalus +, from Tonkin, the head, including 
the crest, is wholly yellowish, and there is a whitish band on 
the thighs. 
One of the most remarkable things about this monkey is 
that it is said to be wholly terrestrial in its habits, being 
found on a more or less treeless plateau. And these habits, 
while quite different from those of the rest of the genus, 
would seem to be shared by those of P. francoisi, which was 
said to have been found ‘sur les grands rochers qui bordent 
la riviére Long-Kiang ” in Kwang-Si. 
Dremomys rufigenis laomache, subsp. n. 
A pallid strongly grizzled race of D. rufigenis. 
General characters about as in true rufigenis, the skull of 
similar proportions—not excessively elongated, the post- 
auricular patches not specially conspicuous, the under surface 
of about the same degree of greyness. But the dorsal colour 
is paler and greyer and much more coarsely speckled, the 
buffy subterminal rings on the hairs over 2 mm. in length as 
compared with rather less than 1 mm. in rufigenis and its 
* Semnopithecus francoist, Pous. Bull. Mus, Paris, 1898, no. 7, p. 319; 
Trouessart, N. Arch. Mus. (5) iv. p. 278, pl. ii. (1913). 
+ Semnopithecus poliocephalus, Trouess. Ann. & Mag. Nat. Hist, (8) 
viil. p. 271 (1911) ; N. Arch. Mus. ¢. c. p. 276, pl. iii. 
a. 
Ie OO ee eee ee a 
