176 MR. R. I. POCOCK ON A HAINAN GIBBON. [May 16, 



brushed clovv n . In the two skins of H. hainanus in the British 

 Musevim, however, the hair on the crown is not so markedly up- 

 standing, 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 Avrist. 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 distally. 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 JS^otes. 



The voice of our Hainan Gibbon is quite difierent 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 

 tongvie, although, as a matter of fact, I believe the lips alone are 

 instrumental in producing the effect. There is then a momentary 

 pause, after which the cry is repeated. It may perhaps 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, hob, hah, hoo, hah, hah, hoo, hah. The 

 "hoo" is on a lower note than the "hah," 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. Tickell's 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 



