Liberia 



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light-coloured whiskers and is carried round the head to the 

 back of the ear. The bare skin of the face is blackish, and 

 the crown of the head, the outer side ot the hands, and the 

 upper part of the tail are black. The rest of the upper parts 

 are a greenish tint caused by the parti-coloured black and 

 yellow hairs. The under-side and extremity of the tail are 

 bright yellow, and there is otten a grey patch at the 

 end of the back by the root of the tail. This green monkey 

 is really only a brighter-coloured variety of the grivet 

 monkey which is found in North-Eastern Africa, and probably 

 stretches right across the continent to Senegal, grading by 

 degrees into the West African type, the Green monkey. The 

 presence ot the Green monkey, therefore, in North-western 

 Liberia would seem to be an incursion of a Senegambian type 

 into this more purely forest region. 



Campbell's monkey (Cercopithecus campbelli) is a fairly 

 common species throughout West Africa, from Senegambia to 

 the Gaboon, including the island of F'ernando Po. It belongs 

 to that section of the Cercopithecine genus which may be 

 described as the "Diana monkeys," though it is of a much 

 less developed type and is without the white streak on the 

 haunches characteristic of the Diana and Mona monkeys. The 

 general colour ot the upper parts is blackish green, fading here 

 and there into a yellowish grey. There is a white brow-ridge 

 which passes without any break or interruption into the whitish 

 whiskers and short beard. The chest, under-side of the limbs, 

 and stomach are yellowish white. 



The true Diana monkey is probably not found in Liberia, 

 where this genus develops a special type — the Bay-thighed 

 monkey {Cercopithecus diana ignita)^ of which I give an illustra- 

 tion. The bay-thighed Diana is coloured much like the typical 

 form, but is easily distinguished from it inasmuch as the 



