1905. | MR. R. I. POCOCK ON A HAINAN GIBBON. 175 
Again, Pousargues * believed hainanus to be established upon a 
specimen of the same species as the type of H. nasutus, from 
Tonkin. This belief was also based upon resemblance in colour. 
Nothing else is known of the characters of nasutus except the 
alleged presence of a “ fine and delicate little nose,” whence the 
name was derived. But since hainanus is not distinguishable from 
other Gibbons by the fineness and delicacy of its nose, judgment 
on the synonymy suggested by Pousargues must be suspended 
until the type of nasutus has been re-examined and described. 
Trouessart, who may have seen the type, gives nasutus the rank 
of a subspecies of the Hainan form. 
No further justification need, I think, be sought for retaining 
the name hainanus for the subject-matter of these remarks. 
Description of the Species. 
Face, ears, palms of hands, soles of feet, and skin black, the 
face with a slightly brownish tinge; iris and exposed portion 
of eyeball blackish. Colour of hair either uniformly black, with 
shining tips, or grey, the roots of the hair being tinged with fawn or 
washed-out brown, their exposed portion shining with silver-grey 
lustre in reflected light, but of a more stone-grey in direct light. 
During the change from black to grey, the coloration is a mixture 
of the two, the black or the grey predominating according to the 
nearness of the time of observation to the incipience or com- 
pletion of the change. 
On the crown of the head a median longitudinal black patch 
with ill-defined edges and extending posteriorly as a narrow 
evanescent stripe persists. A few scanty hairs upon the penul- 
timate phalanx of the fingers and toes and the long hair on the 
brow also remain black. The hair on the body and limbs is 
longish, soft, and thick, but depressed and smooth. It is not 
woolly in the sense that the hair of our young Lar Gibbon is 
woolly, i. e. much resembling a Sheep’s fleece ; nor does ib exhibit 
the fine and silky woolliness of the skin of 1. agilis in the British 
Museum. On the forehead. and crown of the head the hair is 
shorter, fine, and close, and in the living specimen grows some- 
what &@ la Pompadour, being erect on the crown and almost 
porrect on the forehead, so that the head has the appearance of 
being very much higher than in our living example of the Hoolock 
(Hf. hoolock) and in adult skins of H. lar, H. pileatus, and 
H. leuciscus in the British Museum, in which the hair lies smoothly 
backwards. The difference may be briefly expressed by saying 
that in our Hainan Gibbon the hair looks as if it had been 
brushed up, whereas in the others it looks as if it had been 
* Bull. Mus. Paris, 1900, p. 272. Pousargues gave A. Milne-Edwards the credit of 
naming nasutus. Milne-Edwards, however, published no description of the species 
when the name was quoted (Le Naturaliste, 1884, p. 497). Hence if seems that 
Kunckel d’Herculais, who first associated the name with detinite characters, must be 
regarded as the author (Science et Nat. ii. no. 33, p. 86, 1884). 
