1893.] OjST the monkeys of the genus cercopithectjs. 243 



2. On a new African Monkey of the Genus Cercopithecus, 

 with a List of the known Species. By P. L. Sclater, 

 M.A., Ph.D., F.E.S., Secretary to the Society. 



[Eeceived March 8, 1893.] 

 (Plates XVI. & XVII.) 



Since the Monkeys of the characteristic Ethiopian genus Cerco- 

 piihecus were reviewed by Martin \ Geoffroy St.-Hilaire ^, Wagner^, 

 Gray *, and Schlegel \ many additions have been made to the 

 series. Having had occasion to look up the recent contribu- 

 tions to our knowledge of this subject, I have thought that it 

 might save future workers some trouble if I ask the iSociety to 

 accept for publication a new list of the described species, di-awn up 

 while I have been endeavouring to find names for some East- 

 African members of this group which have lately come under my 

 notice. 



The species of Cercopithecus^ are obviously very local in their 

 distribution, and in many cases apparently confined to narrowly 

 restricted areas. I have therefore added under the head of each 

 species a short record of the positively ascertained localities in 

 which it has been procured. I have also indicated the species of 

 which we have received living examples in the Society's Gardens. 



I have not included MifopAthecus (with the last inferior molar 

 with three tubercles only) and Cercocehus (with the last inferior 

 molar with five tubercles) in my list, but only the typical Cerco- 

 pitheci (with the last inferior molar with four tubercles). 



Of this genus as limited by Geoffroy St.-Hilaire some 45 species 

 have been described. I will divide these into two categories : — 

 those of which I have personally examined specimens, and those 

 which I know only from their published descriptions. 



The 31 species known to me may be divided for convenience of 

 treatment into six sections as foUows : — 



Species. 

 Sect. A. jRJiinosticti. 



With a distmct nose-spot, white, blue, or red . . 1-9 



^ Martin, ' General Introduction to the Natural History of Mammiferous 

 Animals.' London, 1841. 



2 Geoffroy St.-Hilaire, in d'Orb. Diet. univ. d'Hist. nat. iii. p. 296 (1843). 



3 Wagner, Saugeth. v. p. 38 (18.55). 



* Gray, Catalogue of Monkeys, &c. p. 20 (1870). 



' Schlegel, Mus. d. Pays-Bas, tiimicB, p. 68 (1876). 



^ The generic name Cercopithecus, though used by Ray, Klein, and Brisson, 

 and in a binomial sense by Erxleben, appears to have been first restricted to 

 the African group of Monkeys to which it is now universally applied by Martin 

 in his ' Natural History of Mammiferous Animals ' (1841). Cercopithecus is a 

 good classical term. Martial says (Epigr. xiv. 202) : — 



" CaUidus emissas eludere Simius hastas, 

 " Si mihi cauda foret, Cercopithecus eram." 



