42 LLOYDS NATURAL HISTORY. 



terised by their rather round head, slender but muscular 

 bodies, narrow loins, and long hind limbs. Their tail is long, 

 though shorter than in the genera next to be described, 

 viz., the Langurs and the Guerezas. Their face is short, 

 the muzzle less elongated, the cheek pouches larger than in 

 the Macaques. The nose is not prominent, and the nostrils 

 are approximated, while whiskers are generally developed, as 

 well as a longer or shorter beard. Their callosities are less ex- 

 tensive than in the Macaques. They have elongated hands 

 with fingers united by a web at their bases ; their thumbs, 

 though distinct, being less developed in comparison than their 

 great-toes. The fur is thick and soft, and in most of the species 

 is ringed with differently and often brilliantly coloured bars. 



The Cercopitheci have the skull depressed, presenting no 

 very distinct brow, for its superciliary ridges are less promi- 

 nent and angular, and their outer margin less projecting in 

 comparison with those of the skulls in the genera already 

 described. The orbits are considerably approximated. Their 

 molar teeth are strongly cusped, and the posterior lower molar 

 has only four cusps, and not five, as in the Macaques ; but as 

 in these animals, the two front cusps are united together by a 

 transverse ridge, and the two hind ones are united together. 



The Guenons are entirely confined to the African continent, 

 where they range from the Gambia to the Congo, and from 

 Abyssinia to the Zambesi; but the different species are each 

 confined to small restricted areas. Being essentially arboreal, 

 they hve entirely in the forest regions, herding together in 

 large troops. They can move from tree to tree with great 

 rapidity, and can climb even on vertical surfaces with sur- 

 prising quickness. They are abrupt and energetic in their 

 movements, restless, and noisy, incessantly chattering and 



