NOVITATES ZOOLOGICAE. 



Vol. Vn. DECEMBER, 1900. No. 4. 



NOTE ON TWO MANGABEY-LIKE MONKEYS {CEBCOCE- 

 BUS HAGENBECKI AND SE3IN0CEBUS ALB I GEN A 

 BOTRSCHILDI), NOW LIVING IN THE MENAGERIE 

 OE THE ZOOLOGICAL SOCIETY. 



By R. LYDEKKER. 



IN the description of Cet-cocehus chri/sogaster, pnlilislied in this Jonrnal for 

 August last,* mention was made of a jowag female mangabey in the menagerie 

 of the Zoological Society of London, which was then lal)elled C. fidiginosus, 

 although it is clearly distinct from that species, and is ])rovisionally assigned by 

 Mr. Rothschild f to the one first named. This little monkey, which now shares 

 the cage of the type male of C. ckrysogaster, possesses the flesh-coloured eyelids 

 characteristic of the more typical representatives of Cercocebus, but is distingnished 

 by the hairs on the crown of the head, as well as some of those on the back, the 

 outer surface of the limbs, and the upperside of the tail being annulated with black 

 and yellow after the fashion so prevalent in Cercopitlieciis. The majority of the 

 hairs on the upper-parts (exclusive of the head) and limbs are, however, of a 

 uniform pale slaty grey colour ; while on the under-parts the hue of the fur is very 

 pale greyish white. The face is black and the callosities are reddish. In its habit 

 of carrying its tail cnrled over its back, in its scream-like cry, as well as in the 

 relative shortness of its thumb, this animal agrees with other Cercocebi, which it 

 also resembles, as already mentioned, in its flesh-coloured upper eyelids. 



Recently Mr. Rothschild has deposited in the Society's menagerie a small and 

 young male monkey (see vol. viii. PI. I. fig. 1), which agrees very closely in the 

 colour of the pelage with the above-mentioned female, but differs in possessing 

 dark upper eyelids. Apart from this feature, it has all the Cercoeehus characteristics 

 enumerated in the preceding paragraph. The fur on the upper-parts is generally 

 very light slaty grey ; but on the head, back, outer sides of limbs, and the upper 

 surface of the tail some of the hairs are ringed with black and yellow, like those 

 of so many of the guenons ; this speckled character of the pelage attaining its 

 maximum development on the head, where it is practically universal. The face is 

 black. The under-parts and the inner-sides of the limbs are very pale greyish white. 



It will thus be seen that the coloration of the fur of this animal is practically 

 identical with that of the above-mentioned female. And it accordingly becomes a 

 question whether the colour of the upper eyelid may difter in the two sexes, being 

 black in the male and white in the female. At present we have no decisive evidence 



• Vol. vii. p. 279 (1900). t Loc. cit. 



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