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Show 1892.] NEW MONKEY FROM SUMATRA. 615 down to the underside of the ear. The undersides of the head (lips included) and the whole of the underside of the body are white or whitish. The limbs are coloured on their outer sides as on the back ; the hands and feet are black. The inner sides of the limbs are white like the belly. The upperside of the tail is grey, like the back, the underside white; only the extreme point is greyish brown both above and below. The iris is brown. The old male is slightly darker than the younger male and the females; the top of the head, and the sides from the eyebrows down to about the angle of the mouth, are black or blackish. The forehead is whitish. The limbs are also darker downwards ; the lower part of the hind limb is mostly black. The young one, in silky dress, is whitish. The head is almost entirely white, and likewise the hind limbs ; the hands and feet are whitish; the back, shoulders, and uppersides of the fore limbs, as well as the upperside of the tail, are greyish (almost like the old ones) ; in the centre of the back there is a whitish patch. The crest on the crown already forms a distinct point on the occiput, whilst the side crests and whiskers are barely discernible. Along the neck runs a black central stripe. The distal portion of the tail is somewhat more hairy than the proximal. The Skull. Old male. Old female. millim. millim. Greatest length 104 97* Zygomatic breadth 80 74 Distance from i^ to anterior margin of foramen magnum 73 63 Intertemporal constriction 46 46 Breadth across face 64-5 65 Breadth of brain-case 69 63 Interorbital breadth 8 8 Breadth of orbit 26 25 Height of orbit 23 21 Breadth of nasal opening 11 10 Height of nasal opening 18 17 Length of nasal bone 12 10*5 Length of palate 34 30 Breadth of palate inside m^1 22 20 Combined length of upper pp. and m m . . 27 27 Combined length of upper molars 18 18 Height of upper canine 20 9 f The zygomatic arch is prominent and strong. The breadth across the zygomata is equal in the female to the distance from the posterior margin of foramen magnum to the base of ^_; in the male * Approximate length, the os occipitale being broken, t Very much worn. |