1889.] MR. 0. THOMAS ON A NEW BORNEAN MONKEY. 159 
5. Description of a new Bornean Monkey belonging to the 
Genus Semnopithecus. By O.prietp Tuomas, Natural 
History Museum. 
[Received March 16, 1889.] 
(Plate XVI.) 
In a small collection of Mammals recently obtained by Mr. Charles 
Hose in Baram, on the north-west coast of Borneo, and acquired for 
the Natural History Museum, there occur several rare and noteworthy 
Mammals. Among these may be mentioned the Trichys recently 
referred to by Dr. Giinther’, specimens of Rhinolophus luctus, Temm., 
of Sciuropterus davisoni, Thos., only previously known from the 
Malay Peninsula, of Semnopithecus chrysomelas, Mill. and Schl., 
and, finally, the subject of the present description. 
The specimen is an adult male, and as it occurred along with the 
other Semnopithecus, one was at first tempted to suppose that it was 
only a very aged individual of the same species, in which certain 
parts had become white; but an examination of the skull proves 
that it is really quite distinct. 
I propose to call it 
SEMNOPITHECUS HOSEI, sp. n. (Plate XVI.) 
Size and form about as in S. femoralis, S. chrysomelas, and S. ob- 
scurus. Crown with a longitudinal crest starting about half an inch 
behind the centre of the forehead ; the longer hairs slope evenly back- 
wards, there being no trace of a reversed occipital tuft as there is in 
some species. General colour of body hoary grey, a colour made up 
by the intermixture of black and white hairs. Crest, centre of crown, 
and nape deep glossy black, as algo are the long eyebrows, and the 
few short hairs scattered about the dark surface of the orbits. All 
the rest of the head, the forehead, temples, sides of the crown and 
neck, cheeks, Jips, nasal septum, chin (where there is a distinct tuft), 
and front of neck pure white, contrasting most markedly with the 
glossy black of the central crest, and with the dark grey of the back 
and shoulders. Outer sides of limbs like back, darkening terminally 
in the hands and feet to deep black. Chest, underside of body, and 
inner sides of limbs as far down as the middle of the forearm and of 
the lower leg white, continuous with that of the chin and throat. 
Tail hoary grey like the back throughout, only rather darker above 
than below, owing to the larger proportion of black as compared 
with white hairs there present. 
Skull light and delicate. Nasal bones long, thin; profile quite 
straight and continuous with the line of the forehead, an arrangement 
very different from the peculiar aquiline nasal outline of S. chrysomelas. 
Nasal opening oval, its breadth about two thirds its heizht, instead 
of three fourths as in the allied species. Bulle low, opaque. Teeth 
as usual. 
* Supra, p. 79. 
