SIMIMD.E 729 
having a better developed chin and wider sternum than any other 
Ape, and differs from the other members of the genus by the 
circumstance that the second and third digits of the pes are united 
by skin as far as 
their last joints. 
Exclusive of this 
species, the Gibbons 
differ but little from 
“one another in size 
and general con- 
formation, and since 
the colour of indi- 
viduals undoubtedly 
referable to a single 
species is remarkably 
variable, there is 
much uncertainty 
about the number of 
species, and much 
confusion in the 
nomenclature. 
Among well-marked 
species we may 
mention the Hoolock 
(H. hoolock), ranging 
from the South of 
Assam through 
Sylhet and Cachar to 
the Ivawadi Valley 
near Bhamo, the 
White-handed Gib- 
bon (H. lar, Fig. 
350), which is found 
in Tenasserim and Fic. 350.—The White-handed Gibbon (Hylobates lar). From 
Blanford, Mammals of British India, p. 8. 
throughout Malay- 
ana, the Dun-coloured Gibbon (H. entelloides, Fig. 351) of Malayana, 
and the Tufted Gibbon (H. pileatus) of Siam and Cambogia. 
The following account of the habits of the Gibbons is taken 
from Mr. W. T. Blanford’s Mammals of British India. “Gibbons 
are thoroughly arboreal, and Hoolocks are almost, if not entirely, 
confined to hill-forest. They move chiefly by means of their long 
arms, by which they swing themselves for prodigious distances from 
branch to branch and from tree to tree. They descend hillsides 
at a surprising pace, their descent being accomplished by grasping 
tbamboos or branches that bend beneath their weight, and allow 
them to drop until they can seize the ends of other bamboos or 
