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Show 176 MR. R. I. POCOCK OX A HAINAN GIBBON. [May 16, brushed down. In the two skins of //. hainanus m the British Museum, however, the hair on the crown is not s o markedly upstanding, nor so long, as in the living example. On the cheeks the direction of the hairs is, generally speaking, upwards. On the upper surface or back of the hand and on the corresponding surface of the forearm the points of the hairs lie towards the ulnar side of the limb, assuming a more and more elbowward direction as that joint is approached. On the palmar and radial side of the forearm, on the contrary, the hairs point for the most part towards the wrist. The palmar surface, however, is marked by a crest formed by the meeting of the two opposing streams of hair, the crest extending obliquely from the radial side of the elbow to the ulnar side of the wrist, the hairs on the ulnar side of it being directed proximally, those on the radial side distall}. On the body the hairs lie backwards, except on the belly, where they incline towards the middle line and form a median longitudinal crest where the two streams meet. This is the area against which the inner sides of the thighs are pressed when the Gibbon is in a sitting posture. On the outer side of the thigh the direction of the hair is upwards (proximad) and backwards, below the knee it is downwards (distad). Additional Notes. The voice of our Hainan Gibbon is quite different from that of the Hoolock. It is a high-pitched trill all on the same note, and shriller even than the high note of the Hoolock's cry. It consists of from about three to six distinct cries repeated in very rapid succession, suggesting almost production by vibration of the tongue, although, as a matter of fact, I believe the lips alone are instrumental in producing the effect. There is then a momentaiy pause, after which the cry is repeated. ^ It mayjperhaps be represented in the following way:-hoo hoo hoo hoo-hoo hoo hoo-hoo hoo hoo hoo hoo-&c. The Hoolock, on the contrary, cries as follows:-hah, hoo, hah, hoo, hah, hah, hob, hah. The " hoo " is on a lower note than the " liah," with which the cry frequently ends. The ordinary expression of anger or remonstrance in the Hainan Gibbon is a prolonged and guttural grunt, which is repeated rapidly and often, and frequently interspersed with a kind of warble when the excitement rises. Both the Hoolock and the Lar Gibbon in the Gardens drink habitually by dipping the back of the hand and knuckles into the dish and licking the water off. They do not scoop it up, in the strict sense of the word, at all. Hence Col. TickelTs generalisation to the effect that in its habit of scooping up water in its hands the Lar Gibbon differs from the Hoolock, which applies its lips directly to the fluid, is contradicted on both counts by our specimens of these species. The Hainan Gibbon, on the contrary, almost invariably drinks direct with her mouth, only very rarely using her left hand for the purpose. It is possible she may have |