256 Mr. R. T. Pocock on 



Genus (Edipomidas, Reicli. 



CEdipiis, Lessou, Spec. Mamm. p. 184 (1840) (nom. preocc.) ; type 



titi, hess. = a;dipus, Liun. 

 Q^dipomidas, lleicbeubach, VoUst. Nat. Affen. p. 5 (1862); ty^Q mdipus. 

 Hapanellu, Uray, Cat. Primates, p. 65 (1870) ; type geoffroyi, Puch. 



On the available evidence I provi.sionally regard this genus 

 as a specialized offshoot of the bald-faced or so-called Sejiio- 

 cehus group of Mi/stax, differing tlierefroni in the modification 

 and reduction in size o£ the ears — a character perhaps corre- 

 lated with the nakedness of the adjoining area of the head. 



To the two above-quoted species, everywhere admitted, 

 Elliot added a third — CE. salaquiensis , which is possibly at 

 most only a subspecies of (E. geojfroyi (' A Review of the 

 Primates/ iii., Appendix, p. 255, 1912); 



Genus Mystax, Gray. 



CercopitJiectis, Gronov. Zoopliyl. p. 5 (1763) ; type midas, Linn, (se- 

 lected by Elliot). 



Midas, Geoffroy, Ann. Mus. Nat. Hist. Paris, xix. p. 120 (1812) (nom. 

 preocc.) ; type n(Jimanus=^midas. 



Mi/stax, Gray, Cat. Moulieys etc., 1870, p. 66 ; type mystax, Spix. 



Tamarin, Gray, op. cit. p. tiS ; type ursulus, Hiiuib. 



Seniocebiis, Gray, op. cit. p. 68 ; type bicolor, Spix. 



Tamarimis, Trouess. Cat. Mamui., Suppl. p. 29 (1899) ; type mystax 

 (now selected). 



Mystax may be regarded as a generalized type of Hapalidse, 

 with normal hands, ears, and dentition. Leontocebus has 

 departed from it by the scansorial specialization of the hands, 

 (Edipomidas by the degeneration of the ears, and Hapale by 

 the specialization of the anterior teeth of the mandible. 



Elliot gave full generic status to SeniocebuSy which contains 

 two species'^ — bicolor, Spix, and martinsi, Thomas, — basing 

 the genus upon the nakedness of the forehead and cheeks as 

 far back as the ears. But this character, merely a mark of 

 maturity, clearly has not the systematic value of those 

 employed in this paper for distinguishing Leontocebus, (Edipo- 

 midas, and Hapale. It is equivalent rather to the characters 

 used by Gray, and derived from the hairiness of the aural 

 area, for splitting up Hapale into several genera, which 

 neither Elliot nor his immediate predecessors adopted. 



Moreover, adult exaiuples of Mystax leucojyus, Giintr., a 

 species which, as I have stated above, Elliot quite wrongly 

 referred to the genus Hapale — or Gallithrix, as he called it, — 

 have the head covered with short hair back to the ears, and, 



* As stated above, S. meticulosus, Elliot, is synouymous with Q£dipo- 

 midas cedipus. 



