i 74 
APES AND MONKEYS. 
centre; and they all have whiskers and a beard, the latter being either broad and 
single or separated by a division in the middle, and inclining back on either side. 
While in some species, like Humboldt’s saki, the long hair covers the head, body, 
and tail; in others this long hair is confined to the head, where it may be present 
on the crown, cheeks, and chin, or only on the two latter. 
THE WHITE-HEADED SAKI Q- nat. size). 
The headquarters of the sakis appear to be Guiana and the Valley of the 
Amazon, although they are also found in other districts. Mr. Bates speaks of them 
as being delicate animals, difficult to keep in captivity. They are described as being 
gentle and inoffensive in disposition when in confinement; but we know very little 
of their habits in the wild state, although it appears that they are normally silent. 
The White-Headed Saki (.Pithecia leucocephala). 
The white-headed saki, of which we give a figure, is an inhabitant of 
