Arramjement of the Marmosets. 107 



their earlier division simply into two by the char.nctera of the 

 teeth hiwitiG^ been rejected by Elliot *, whose arrangement in 

 turn has been modified by Pocock '\. 



Elliot recognizes five genera, as follows : — 



Seniocehus, with type hicolor. 



Cercopitheeus, type m'ldas. 



Leontocelnis (type chn/somelas) , with two subgenera, 



7^(tmarinus (type mystax)^ and Marikina (type 



chrijsomelas). 

 (Edipomidas, type rcdijnis. 

 CalUthrix, typo jacclms. 



Pocock modifies this, largely on the characters of tlie ears 

 and feet, to the extent of rejecting AS'ewioceJtfs, which he unites 

 under the name of Alystax witli Cercopitheeus and the 

 " Tamariniis" subgenus o( ^^ Leontocebiis,^^ recognizing ieo^- 

 tocehns as a full genus, and, of course, also recognizing Calli- 

 thn'.v, which he rightl}^, for the time being, calls Hapale. 

 His four genera are thus : — 



Leontocehua, type chrysomelas. 

 (Edipomidas, type cedipus. 

 Afj/sta,i\ type mystad'. 

 Ilapale, type jacchus. 



But it appears to me that in this scheme there is no very 

 satisfactory place for the Seniocehus section (type hicolor), 

 for wiiile the general appearance and short-haired or naked 

 face of its members show relationship to the short-eared 

 (Edipomidas, their ears are as long as in ^[yslax. To get 

 out of this difficulty 1 would suggest that we should recognize 

 Seniocehus, with which, besides the naked-faced hicolor, 

 viartinsi, and meticidosus, we might place lexicopxis, with face 

 short-haired, though not naked. 



It is noteworthy that all the groups, used here for con- 

 venience' sake as genera, can be readily distinguished by the 

 coloration of the tail and limbs, in Sj)ite of the wide variation 

 in the colours of the body and head. On this basis, and with 

 the difference in the presence or absence of ear-tufts, I would 



* 'Primates,' i. pp. 179-233 (1912). 



t "The Genera of llapalidre," Ann. & Mag. Nat. Hist. (8) xx. p. 247 

 (1917). 



