678 MR. R. I. PococK — A REVISION OF [June 18, 



Of tliese talwpoin. was made the tyjje of a- separate i^eiius, Mio- 

 plthecus, by Is. GeofFroy St. H. (C.R. Acad. Sci. xv. p. 720^, 1842), and 

 this author legitimately selected as the type of Cercojyitliecus the 

 species named Gcdiitrichus, which is the same as sahceits of Ei-xleben 

 (Oat. Method. Mamm., Primates, p. 18, 1851). 



Since that date the genus Gercojiiihectis has been broken up 

 into a considerable number of named minor groups, notably by 

 Reichenbach and Trouessart. No type species were intention- 

 ally indicated by the authors who named these groups or sub- 

 genera. One only, namely Cynocebus, was based upon a single 

 species. Its type therefore was fixed from the beginning. More- 

 over, in three others, namely Mona, Petaitrista, and JJiana, the 

 type was, ijjso facto, indicated to stai-t with by the adoption for 

 the subgenus of the name of one of the si^ecies comprised in it. 

 Of the majority, embracing more than one species, the types have 

 up to the present remained unsettled ; and since it is now con- 

 sidered expedient to fix the type species of all genera and subgenera 

 in Zoology, I have attempted to revise the subgenera of Cerco- 

 pitheciis for that purpose and have selected a type species for each 

 out of the residuum of species remaining from the process of 

 elimination practised by authors who have preceded me. 



The results arrived at are briefly expressed in the following 

 list :— 



Gallithrix Reich.', 1863 (preoccupied). Type by selection 



C. callitrich'ihs [ = sabceus Linn.). 

 Oercopithecus Erxl., 1777. Type by selection C. callitrichus 



(^ = sabceus Linn.). 

 Chlorocebus Gray-, 1870. Type by selection C. sabcmi.s Linn. 

 Cynocebus Gray ^, 1870. Type ab initio C. cynosurus Scop. 

 DiADEMiA Reich. \ 1863. Type by elimination and selection 



C. leucampyx Fisch. 

 Diana Trouess.^, 1897. Type by tautonymy G. diana Linn. 

 Erythrocebus Trouess.^ 1897. Type by selection C. patas 



Schreb. 

 MiOPiTHECUS Geoffr., 1842. Type ab initio C. tcdap>om Schreb. 

 MoNA Reich.'', 1863. Type by tautonymy G. mono, Linn. 

 Otopithecus Trouess.'', 1897. Type by selection G. pogonias 



Benn . 

 Petaurista Reich. \ 1863. Type by tautonymy G. jMaurista 



Schreb. 

 PoGONOCEBUS Trouess.**, 1906. Type G. diana Linn., by sub- 

 stitution of Pogonocebus for Diana Reich., preoccupied. 

 Rhinostic'tus Trouess.\ 1897. Type G. 2)ctatirista Schreb., 



by substitution of RJvinostictns for Petaurista Reich., 



preoccupied. 



1 Reichenbacli, Die volls. Nat. Affen, pp. 105-122 (1863). 



- Gray, Cat. Monkevs B.M. (1870). 



s Trouessart, Cat. Mamm. i. pp. 16-22 (1897). 



•* Trouessart, Cat. Mamm. Suppl. pp. 10-15 (1906). 



