326 



MR. 11. LYDEKKER ON GUEREZA MONKEYS. [NoV. 28, 



expand into a brush. A fnrther development is exhibited by the 

 typical form of Colobics palliatus (text-fig. 55), from British East 

 Africa and the neighbouring districts, in which the two lateral 

 white face-tufts are connected by a white band across the brow, 

 while the shoulder-tufts are of considerably larger size, a small 

 whitish patch beneath the tail occupies the perineal region, and 

 the tail has its terminal third whitish, the middle third grey, and 

 the remainder black. A nearly allied type is found in the form 

 of the Mountain Guereza {C. ruivenzorii), of the Ruwenzori dis- 

 trict, in which the white perineal patch has assumed much larger 

 proportions, although the extreme tip of the tail is alone greyish ; 

 the latter feature placing the species, so far as the coloiiring of 

 this ap23endage is concerned, next to the Black Guereza. 



Text-fiff. 55. 



Mantled Guereza {Colohus pallicd^is). 



From the three foregoing black-and-white forms there is an easy 

 transition to Sharpe's Guereza (C. sharpei), of Nyasaland, in which, 

 as shown in text-fig. 56, p. 327, the white brow-band, face-, throat-, 

 and shoulder-tufts have become very long and jjronounced, the 

 hairs of the last hanging down the outer side of the fore-limbs. 

 Moreover, the white terminal third of the tail has developed a dis- 

 tinct tuft, not dissimilar in relative size and form to that of a 

 lion's tail. A step still further in advance is taken by the typical 

 Guereza (C. guereza) of Abyssinia and North-east Africa generally. 

 In this handsome monkey the white shoulder-tufts extend back- 

 wards to form a long mantle, falling down each side of the body 



