682 
THE LIVING WORLD. 
its unusually powerful jaws and teeth can do the greatest execution. It sleeps 
in the daytime and prowls about at night. Its long hairs are gray at their 
points of insertion and for some part of their length, and brown the rest of the 
way, so that, as the fur is stirred, the animal may assume any hue which can 
be drawn from 
these compo¬ 
nent colors. 
Its w e 1 1- 
rounded head 
is covered by- 
long, black 
hair scrupu¬ 
lously parted 
in the middle. 
The White- 
headed Saki 
(Pithecia leu- 
cocephala) is 
graceful in 
form and un¬ 
usually sym- 
ursine howlers. metrical in its 
proportions. 
From the top of its head, which is the deepest black, a partial cowl, coming 
off into whiskers and beard extends, and by its excessive whiteness forms a 
startling contrast. The lower part of the throat and chin is orange-colored and 
entirely destitute of hair. It is said to live principally upon wild bees, although, 
it sweetens its repast 
with their honey. Its 
other names are the fox¬ 
tailed monkey and the 
black yarke . 
The Cacajao (My- 
cetes caray a) has aflattish, 
black head and an ex¬ 
tremely short, docked tail. 
It is brownish-yellow in 
color, with a change to 
black for the head and 
front legs. Its three 
inches of tail seem a 
weak ending to its two 
feet of stout body. It is 
scarce, even in its habitat 
on the Rio Negro. It 
is easily domesticated, but always remains shy and timid. The reader may 
find it called, in books of travel, the caruiri , the hideous monkey , the chucuzo y 
or the chucuto. 
The White Acari ( Brachyurus calvus , or Ouarcharia calva ,) is another- 
HAIRY HOWLING MONKEY. 
