THE LIVING WORLD. 
702 
chattering. Some of the family secrete in their stomachs a substance called 
bezoar and an essential part of an Oriental pharmacopoeia. It is sometimes 
called the bezoar moiikey from this fact. When young it is reddish-yellow and 
gradually changes to black. 
The Gibbon (. Hylobates) is considerable in size, having a stature of quite three 
feet. Its head is small and round, muzzle short, face pleasant in expression. 
It is wrapped in dark fur which is relieved in part by white. Its arms and hands 
are unusually long and out of proportion to the body. It is frugivorous, gentle, 
intelligent and marvellously supple. It is readily domesticated, in which state 
it is very affectionate. 
The Mourning Gibbon (. Hylobates funereus) is black with a change to 
ashen gray on the outside of its arms and legs, which are covered with long hair. 
* * The Silver 
Gibbon (. Hyloba¬ 
tes leuciscus) is 
silver-g ray in 
color, changing to 
black on the face 
and the palms of 
the hands, and to 
white in the bushy 
hair and whiskers 
which cover its 
head, cheeks and 
neck. Its height 
rarely exceeds 
three feet. 
The Cinder Gibbon [Hylobates cinereus ) belongs to Java and takes its 
name from the color of its hair. It is gentle, affectionate and easily domesticated. 
The Simpai [Presbytes metalophors ) is long-tailed, its arnjs are delicate and 
well-proportioned, and hands slender, and is most distinctly four-footed in its 
locomotion. In color it is a light chestnut-brown intermixed with golden tints, 
changing to gray on the under parts. Its form is slight and graceful, and its 
foot and three-quarters of length is increased by some three feet of tail. The 
black hair on its head, cheeks and neck resembles a fur hood and has given 
rise to its popular name of the black-crested monkey. Its habitat is Sumatra, 
whose fauna receive such frequent mention. 
The Wou-wou [Hylobates agilis) is of fair stature—about four feet—and 
but for the excessively long hands and fingers its body would be not unlike 
that of a human being. There is a great variety in the heads of persons, but 
even one who is not a craniologist will at once perceive the wide gulf which 
separates them from the patterns used by the monkey tribe. The cocoanut- 
s’haped head of the wou-wou has a low forehead, from which it retreats until 
it reaches a peak or table-land. The eyebrows project, its nose is broad and 
flat, its mouth a long, thin slit, and its chin quite short. Its long, fine hair is 
chocolate-colored, the back and thighs tending towards yellow. The face of 
the male is dark blue and is furnished with white whiskers and a white band 
above the eyes. Sumatra is the habitat of the wou-wou , where it is often called 
the ungaputi and the active gibbon. 
POSITION OF THE GIBBON WHEN S' 
