722 Mil. li. 1. pococK — A REVISION OF [June 18, 



backwai'ds towards the lower edge of the eai' ; but having the 

 throat, chest, belly, and the inside of the limits, at least proxinially, 

 dark ashy grey and not white or greyish white. Nose-spot, 

 when present, subquadrate or diamond-shaped. 

 Distr. W. Africa : Benin, Cameroons, and Congo. 



Key to the Sj^ecies. 



a. Upper lip with a moustache of short black hairs underlying a clear 

 pale blue transverse stripe ; chin black ; nose naked or clothed 



with pale pubescence ; no black brow-band ccpJins. 



a'. Upper lip with black hairs onlj- towards the corner of the mouth ; 



no blue stripe ; chin pale (? flesh-coloured) ; nose with distinct 



patch of red or white hairs; a distinct black In'ow-band. 



1). Nose-patch red ; ear-fringe red ; no occipital stripe ; some black 



below elbow ; legs grej'ish black, darker than back ; tail red, 



except above at base eri/throtis. 



h'. Nose-patch almost wholly white ; ear-fringe white ; an occipital 

 stripe ; arms and legs grey, speckled, paler than dorsal surface ; 

 tail red in its proximal half beneath sclateri. 



Cercopithecus cephus Linn. (Plate XLI. fig. 3. 

 Text-fig. 187, p. 723.) 



Simia ceplius Linn. S3\st. ISTat. i. p. 39, 1766. 



Cercointlieciis cephus of most subsequent authors. 



Face bluish slate-grey, with a brilliant whitish-blue stripe on 

 the upper lip beneath the nostril extending obliquely outwards 

 from the middle line. Beneath this a moustache of black hairs 

 borders the lips, and exjjanding externally merges with the black 

 hairs clothing the lower part of the cheek close to the face. Some 

 black or blackish hairs also on the chin. Nose naked or clothed 

 with pubescence, which never forms a very definite patch. Hairs 

 on the cheek directed obliquely downwards and backwards ; 

 those just beneath the temple- stripe clear yellow, except close to 

 the ear, where they are annulated. Beneath this patch the hairs 

 are strongly annulated black and yellow, the black predominating 

 neai' the face. Hairs on ear yellowish white. On the upper side 

 of the head the paleannuli on the hairs are greener than those on 

 the body, which are almost rusty red. On the outside of the 

 limbs, too, the hairs are . speckled, but the dark element is 

 dominant, making them darker than the body ; hands and feet 

 black. Tail variable in coloui', mostly coppery i-ed or coloured 

 much like the back above and grey below. 



Loc. Congo and Gaboon. 



The specimens of C cejjhus that I have seen may be refer]:'ed to 

 two categories characterised by the coloui- of the tail, which is red 

 in the one and the same colour as the body in the other. I do 

 not certainly know what value in taxonomy this feature possesses. 

 It was well known to Pousargues *, who pointed out that of the 

 series of ten specimens in the Paris 'Museum all have red tails 

 except three,which came respectively from Doume-Ogowe(? Doume 

 on the Ogoue) and Mayumba, near the ocean (? sea-level), all 



* Ann. Sci. Nat. (8) iii. p. 211, 1896. 



