684 Mil. 11. I. rococK — a revision of [June 18, 



I'epi'esented as white. Both were taken by Bufibn from a livinjt^ 

 •specimen. But since Buftbn's time no white-bellied Monkey of 

 this grouj? appears to have come to hand, although a verj'^ large 

 number of examples have been brought to Eui'ope from Guinea, 

 the country whence the type of C. roloway came. The explanation 

 of Buflbn's assumed mistake is probably due, I think, to the fact 

 that when one of these Monkeys is seated the white of the inside 

 of the thighs is sometimes continuous with that of the chest and 

 conceals the black of the belly, so that at a casual glance the 

 whole of the imder side appears to be white. 



If in the future Buftbn is proved to have observed correctly in 

 the matter of the whiteness of the belly, the species which here 

 passes as G. roloway will require a new name. 



It may be added that young examples of G. roloway are nsually 

 coloured like tlie adults. Perhaps, however, the thighs get 

 darker with age ; oi- possibly specimens with white, lemon, or 

 reddish thighs represent distinct local races. I have not seen 

 sufficient localised material to determine this point. One young- 

 example, now living in the Gardens, had no trace of red on the 

 back when first received, but subsequently acquired it, and difiers 

 in no respect now from typical specimens. 



The XEGLECTUS-group. 



Gercoiyitlieci harhaii Sclatei' (in part.) ; Poyonoceh'as Trouess. 

 (in part.). 



Prevailing colour of head, cheeks, neck, dorsal surface, and 

 sides of body yellowish grey, speckled with black. Upi3er part of 

 face blackish, lower pait (including tip of nose, upper and lower 

 lips, and chin) clothed with white hair, the skin blue. A mesially 

 interrupted black brow-band. Behind this a large fiery-red 

 diadem broad in the middle and tapering laterally. Behind this 

 a sharply defined jet-black transverse band, narrowest in the 

 middle and expanding at the sides, where it extends backwards 

 to the ears. On the throat a jDatch of white hairs ending in a 

 point behind on the fore part of the chest and continuous with 

 the white of the chin in front. The hair- of this area mesially 

 long, forming a white beard, which is not restricted to the point 

 of the chin. Hairs of the chest short, directed backwards and 

 downwards. Fore leg black externally, at least below the elbow, 

 its radial aspect and area above elbow olive-green, speckled ; 

 a black stripe set oflf by a paler one running obliquely down the 

 upper portion from the shoulder to the radial side of the elbow 

 and continuous with the radial edge of the black of the lower 

 arm. Tail with its basal two inches the same colour as the back ; 

 the rest jet-black. Area of rmnp beloAv the callosities white and 

 continuous with the white of the innei- side of thighs and of the 

 pubic area. On the outer side of the thigh a crescentically 

 curved pale stripe runs from the Avhite beneath the callosities and 



