GUENONS. 
103 
upper parts either greyish or olive-brown, finely grizzled with grey or yellow. 
From above the eyes to the ears there is a black streak, while there is also a stripe 
down the back of the same hue; and the hands and feet, as well as the tail, are 
likewise black. The forehead, the whiskers, the small moustache, and the under 
parts of the body and the inner sides of the limbs are yellowish. This species has 
been obtained from Fernando Po and the Gabun. 
Campbell’s monkey, which inhabits Fernando Po and Sierra Leone, may be 
distinguished by the absence of the black streak running from above the eyes to 
the ears, and also by the whitish colour of the under-parts and inner sides of the 
limbs. The general colour is blackish-olive, washed with yellow. 
The red-brown colour of the chest and under-parts, from which it takes its 
name, are amply sufficient to distinguish the red-bellied monkey; but as additional 
characters we may mention that the outsides of the thighs and legs are greyish- 
black, while the front of the thighs and the under surface of the tail are greyish- 
white. 
Finally, Wolf’s monkey, which has light under-parts, differs from the other 
species in the ferruginous colour of the legs, as well as by the light patches on 
the inner sides of the arms and thighs. This species is interesting as being the 
only representative of the mona group (if we exclude the larger Sykes’s monkey) 
which is found eastward of Western Africa. 
The Black-Bellied Monkey (Cercopithecus pluto). 
The black - bellied or pluto monkey, from Angola, is another West African 
species, readily distinguishable by the 
dark colour of the under - parts of 
the body and the inner sides of the 
limbs, which are typically of a reddish- 
black. 
Like the species of the mona group, 
there is no beard, but large bushy 
whiskers, well shown in the accompany¬ 
ing figure. 
The general colour of the fur is black, 
finely grizzled with grey; the forehead 
has a white band, and the sides of the 
forehead, as well as the shoulders, chest, 
tail, and limbs, are entirely black, and 
there is no white on the haunches in the 
typical form. 
Dr Anderson identifies, however, 
with this species the so-called diadem 
monkey (C. leucocampyx), which also 
has black under-parts, but is distin¬ 
guished by a white streak across the 
haunches. (From Gray, Proc . Zool . Soc .) 
THE BLACK-BELLIED MONKEY. 
