THE THUMB LESS MONKEYS 89 



THE URSINE COLOB (Colobus ur sinus} 



Closely allied to the last species is the so-called ursine colob from Fernando Po, 

 in which the mane is grayish, and not longer than the hair on the sides of the body. 

 Yet another nearly related West African monkey is the Angola colob ( Colobus ango- 

 lensis}, which differs from the king monkey in that the chest and two-thirds of the 

 lower portion of the tail are black. 



THE WHITE -THIGHED COLOB (Colobus villerosus) 



More markedly distinct than the preceding from the king monkey, is the white- 

 thighed colob of Western Africa. This species is distinguished by the absence of a 

 mane on the head and throat, although it has a small fringe round the face. The 

 general color is glossy black, but that of the forehead, of the frill round the face, 

 and on the chin, is white. The tail is also white, but the most distinctive charac- 

 teristic of the species is the silvery-white of the thighs, from which it derives its 

 name. The haunches are, moreover, generally gray. The white hair of the thighs 

 is shorter than that on the body. 



THE BAY COLOB (Colobus ferrugineus) 



Very different in coloration from any of the species yet mentioned is the bay 

 colob, definitely known from the Gambia and the Gold Coast, and of which a single 

 specimen was brought alive to England in the autumn of 1890, but, unfortunately, 

 did not long survive its arrival. 



This handsome species has comparatively short hair, which, on the crown of 

 the head and the back and upper part of the sides is blackish-gray, while the cheeks 

 and throat, as well as the under parts and the limbs, are of a rich ferruginous bay. 

 The upper part of the root of the tail is blackish, but the remainder of a reddish- 

 brown. The ears and the greater part of the face are bluish, but the nose and lips 

 are flesh colored. Altogether the bay colob is a striking species, which, once seen, 

 will always be easily recognized. 



THE CRESTED COLOB (Colobus cristatus) 



The last of the thumbless monkeys we shall mention is the crested colob, 

 which is likewise a West African species. It is readily distinguished by its short 

 yellowish-brown fur, which becomes grayer on the front of the body ; the shoulders 

 and outer sides of the arms, the throat, chest, under parts, and inner sides of the 

 limbs being grayish-white. It differs from all the other species in that the hair on 

 the forehead radiates from two points on the temples, and that there is a low erect 

 crest of longer hairs running along the midddle line of the head. 



