50 MR. C. BODEN KLOSS ON 
2. Macaca assamensis. 
Muacacus assamensis, McClelland, P. Z. S. 1839, p. 148 ; Anderson. 
Anat, and Zool. Res., p. 64 (1878); Blanford, Fauna Brit. Ind, 
Mamm., p. 15 (1881). 
1 2 subad. from Me Puan, N.N.E. of Lakon Lampang, North 
Siam, 1,500-2,000 ft. Messrs. Williamson and Smith’s collectors. 
September 1917. [ No. 2671/CBK. }. 
This animal just falls short of being adult, in that the last 
molars, though well up and with the anterior cusps worn by contact 
with the teeth in front of them, do not yet engage with each other. 
The species was very shortly described by McClelland and the 
type is now lost, but before it disappeared it was examined by Ander- 
son who fortunately published a good account of it. 
I think this specimen is undoubtedly an example of M. assamensis 
but am unable to say whether it is truly typical. One feature shown 
is curious; the tail, which does not appear to be either mutilated or 
malformed, is not only merely an inch and three-quarters long, but is 
only a quirter of an inch in diameter; it is thickly clothed with hair 
and thus in no way resembles the naked stump-tails of arctoides and 
rufescens. In baing thus well clad it resembles that of assamensis, but 
the typical animal has the tail about half the length of head and body 
and about an inch in diameter. 
There is no whorl or ridge of hair on the top of the head; the 
hair, quite short in front and longer on the nape, grows quite smoothly 
backwards and sideways from the forehead. Pelage slightly wavy. 
The upper parts of the body are light mummy brown, very 
indistinctly annulated with golden ochraceous, the latter colour increas- 
ing in amount on the shoulders; sides and limbs paler, arms suffused 
externally with golden ochraceous like the shoulders, the legs ting- 
ed with drab: crown and nape a little paler than the back: sides of 
neck and under-parts thinly clad with pale greyish buffy fur lightest 
on throat and chest. Tail paler than the rump and golden buff above ; 
hands and feet like the limbs. Face thinly clad with short pale hairs. 
Buttocks covered to the edges of the callosities. 
Native collector’s external measurements :—head and body, 465; 
tail, 44; hind foot, 131. Skull :—greatest length, 118.5 ; condylo-basal 
length, 85; basal length, 76; palatal length, 44; upper molar row 
JOURN, NAT, HIST. SOC, SIAM. 
