THE MANGABEYS. jy 



longer. They agree with the Macaques, and differ from the 

 Cercopitheci, or Guenons, in having a fifth hinder cusp to the 

 posterior lower molar tooth in each jaw ; and differ from both 

 in the hairs of the body rarely being ringed with different 

 coloured bars, as is the case with the species of both the genera 

 just mentioned. The nose is situated behind the end of the 

 muzzle. Their most obvious external character, however, and 

 one from which they derive their common name of " White- 

 eyeUd " Monkeys, is their pure white upper eyelids, the white 

 streak being more distinct on the inner half of the eyelid than 

 on the outer. These Monkeys want the laryngeal air-sacs 

 seen in the Macaques ; but they have large cheek-pouches and 

 a simple stomach, as in the latter. Their tail is always long, 

 quite equalling the length of the body. The hands have a web 

 between each of the fingers, that between the thumb and index 

 finger being very short ; in their feet, the great-toe, which is 

 widespread, has a short web uniting it with its neighbour ; the 

 second and third toes are united nearly throughout their whole 

 length, the fourth is webbad and united to tlie third and fifth 

 as far as their mid-joints. 



The Mangabeys are confined to West Africa. Like their 

 relatives, the Macaques and the Guenons, they are arboreal, 

 living in troops in the forest country, and feeding chiefly on 

 fruits. 



I. THE SOOTY MANGADEY. CERCOCEBUS FULIGINOSUS. 



Cenocebus fuUginosus, Geoffr., Ann. Mus., xix., p. 97 (1812); 



Gray, Cat. Monkeys Brit. Mus., p. 27 (1870) ; Schl., Mus. 



Pays-Bas, vii., p. 95 (1876). 

 Le mangabey^ F. Cuv., Hist. Nat., Mammif., livr. vi. (May, 181 9), 



