THE COLLARED WHITE EYELID MONKEY. 
Cercocebus JEthiops. Geoff. 
The Collared differs from the Common White Eyelid 
Monkey principally in the deep chestnut brown of the 
upper surface of its head, and in the collar of pure 
white crossing the fore part of its neck and including 
the large bushy moustaches which extend forwards 
upon the cheeks and pass backwards beneath and 
behind the ears. The rest of the upper surface of the 
body is of the same slaty or soot-coloured hue as that 
of the former ; the hands, face, and ears have nearly 
the same tinge ; and the under surface is equally of a 
light ashy gray. Its form and proportions are similar, 
except that it is somewhat smaller. The legs are 
equally slender, and the tail equally long and thick. 
The hair which covers the body is also, as in the 
preceding species, long and soft to the touch. A re- 
