( 595 ) 



of Cercocehtis, inclusive of albigena ; and this erroneous statement has been copied 

 by all subsequent compilers. C. albigena differs, therefore, from the more typical 

 Cercocebi, not only by its crest of long hair, but likewise by its black upper eyelid ; 

 and there is accordingly much to justify its separation as a subgenus or genus ajiart, 

 for which Gray's name of Samnocehus * is available. 



As regards minor characters of the typical C. albigena, it may be mentioned 

 that it has a long superciliary fringe, but the cranial crest is comparatively short and 

 confined to the occipital region of the head. The whiskers are moderately developed, 

 and of a pale grey colour ; and this greyness spreads to some extent over the 

 shoulders, nape, and chest. In Gray's Catalogue it is stated that the callosities 

 are black ; but, from an examination of the specimen, there is little doubt that 

 in life they were bright-coloured. 



A young skin in the Museum (No. fjO. 12. 83), taken from a specimen formerly 

 in the Zoological Gardens, agrees in many features with the type, but in other 

 respects comes nearer to the next example. 



This is a mounted male skin (also from the Zoological Gardens) in the same 

 collection (No. 57. 8. 3. 3), in which the crest extends along the whole length of 

 the middle line of the head to join a sujierciliary fringe, which is long. The 

 cheeks are thicker than in the typical albigena, and the whiskers are larger. On 

 the nape, chest, and upper part of the arms, the hair is blackish brown, and the 

 whiskers have a slaty tinge. 



So far as I can gather, this specimen accords very closely with the description 

 of Cercopithrots aterrimtts Oudemans,t which was founded on a young siieciraen 

 from the Congo, subsequently referred by Mr. P. L. SclaterJ to Ce/rocebiis, anil 

 still later identified by Mr. Jentinck § with C. albigena. It is true that the 

 form of the crest is not specially referred to in the descrijition, but even if this 

 differ from the foregoing sj)ecimen, such difference may be due to immaturity 



Regarding, then, the two foregoing specimens as probably referable to alerrimtis, 

 the living monkey under consideration (vol. viii. PI. I. fig. 2) differs by the total absence 

 of the forwardly projecting superciliary fringe of long hairs, as well as by the still 

 more peaked form of the head-crest, and the presence of large whiskers in front of 

 and jiartly concealing the ears. Its general colour is uniformly black, and the face 

 is more hairy than in the large undetermined male mentioned below now living in 

 the Gardens. If No. 57. 8. 3. 3 be rightly identified with atcrrimus, the present 

 animal apparently indicates another race of the sj)ecies, which may l)e provisionally 

 called Sentnocebus albiqena rotlitichihii. 



I now come to a monkey of the same general type presented by Sir 11. H. 

 Johnston to the Zoological Gardens. It is a male, and was obtained near Lake 

 Tanganyika ; its skin i.s now in the British Museum (No. 96. 4. 28. 1). This 

 animal was at first identified by ]\Ir. JSclater || with ('. albigena, but subsequently 

 provisionally assigned by him to C. aterrimus. 



It has the head-crest small and occipital in position, as in the typical 

 albigena ; but the superciliary fringe is mnch shorter, and the whole face and 

 fore-quarters are entirely black. It accordingly appears to indicate a fourth race of 

 the species, for which the name albiqena johnaloni may be suggested. 



Mr. 0. Neumann (Zool. .Tahrlnich. vol. xiii. p. 533. lOUU), states that tliese 



* Gray, oj;. r,7.,p. 27. § Ihid. ISft.i. pp. ;)S8 and 33'.i. 



t Zool. (iarlen, vol. xxxi. p. 207 (IS'JD). || Op. fit. 189-1. p. Mi. 



J Piw. Zoid. Soc. Loud.. IStiX p. 2SG. 



