1893.] ON' THE MO:S'KETS or THE GEKUS CERCOPITHECFS. 243 



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

 witli a List of tlie known Species. By P. L. Sclater^ 

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



[Eeceired March 8, 1893.] 



(Plates XVI. & XYII.) 



Since the Monkeys of the characteristic Ethiopian genus Cerco- 

 ^ntJiecus were reviewed by Martin \ Greoffroy St.-Hilaire', Wagner % 

 Gray ^, and Sehlegel '', 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 Society to 

 accept for publication a new list of the described species, drawn up 

 M"hile 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 CercojniJiecus^ are obviously very local in their 

 distribution, and in many cases apparently confined to narrowly 

 restricted areas. I have thei'efore added under the head of each 

 species a short record of the positively ascertained localities in 

 Mhich 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 Mj/ajntJiecus (with the last inferior molar 

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

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

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



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

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

 those of -u'hich 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 follows : — 



Species. 

 Sect. A. Rhinosticti. 



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



' Martin, ' General Introduction to the Natural History of Mammifcroua 

 Animals.' London. 1841. 



2 GeofTroy St.-Hilaire, in d'Orb. Diet. univ. d'Hist. nat. iii. p. 29G (1843). 



' Wagner, Saugeth. v. p. 38 (18.")5). 



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



" Sehlegel, Mus. d.Pays-Bas, Simla, p. 08 (1870). 



" The generic name Ccrcopithecus, though used by Ray, Klein, and Bris.son, 

 and in a binomial sense by Er.xlebcn, 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 Mammiforous Animaln ' (1841). Ccrcopilhccus is a 

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



" Callidus einissas ehidero Simius hastas, 

 " Si niihi Cauda foret, Ccrcopithecus cram." 



