Descriptions of East Asiatic Mammals 139 
Gibbon may eventually be discovered near the south coast of 
China. The length of the head and body is about 20 inches, of 
the foot 6 inches (Osgood). 
The White-cheeked Crested Gibbon, H. c. leucogenys of 
Laos and Siam, considered by Pocock equal to the Hainan form, 
has the cheeks and throat buffy white instead of black. Females 
are golden buff. 
Gabriella's Crested Gibbon, H. c. gabriellce of southern 
Annam and southern Laos, also has the cheeks and throat con- 
trastingly colored, but reddish buff in place of the buffy white 
in leucogenys. 
In the remaining species of Gibbons a white line on the brows 
is present and the body and limbs are only occasionally black in 
males of the form H . lar pileatus. 
The White-handed Gibbon, Hylobates lar, is usually 
brown, sometimes blackish brown, rarely buffy brown. The 
hands and feet are whitish buff to above the wrists and ankles. 
A whitish ring surrounding the reddish brown face may be ex- 
panded onto the cheeks and throat. The females are often pale 
buffy. This is a small Gibbon, the length of the head and body 
varying from 20 to 22% inches, the foot from 5% to 6 inches. 
The typical White-handed Gibbon is found up to 3500 feet in 
the lower part of the Malay Peninsula, lower Burma, and 
Arakan, but the total range of H. lar, including its other sub- 
species, extends to Siam and Cochin-China. 
Several geographical races of the White-handed Gibbon are 
recognized : H. I. entelloides from Tenasserim has the white of 
the brow, face, and hands reduced in extent. H. I. pileatus of 
Siam, Cambodia, and Cochin-China has a distinct blackish cap 
on the head surrounded by a grayish band. Much of the coat 
in males may be quite black, and the pale areas of the face and 
extremities may be shaded. A race, H. I. albimanus, occurs on 
Sumatra. 
In continental Malaysia there are two more types of Gibbons, 
