LASIOPYGA 291 



arrived at either ab initio, by selection, elimination, tau- 

 tonymy, or by substitution, and after a few general re- 

 marks gives a key to the various groups in which he 

 places the species. These are thirteen in number arranged in 

 the following order : Diana group ; Neglectus group ; Leu- 

 campyx group ; Nictitans group ; L'Hoesti group ; Mona group ; 

 Albigularis group; Erythrogaster group; Petaurista group; 

 Cephus group ; ^thiops group ; Patas group ; and the Talapoin 

 group. In discussing the species of these various assemblies, 

 he does not follow the order given in the key, for the Patas 

 group which is first, is treated last, probably for the excellent 

 reason that his material for these monkeys was so scant, he 

 could give descriptions of only two species, and a simple list 

 of those described with references to the publications in which 

 they were to be found. This was of less importance, however, 

 for these red monkeys should not be placed in Cercopithecus, 

 (Lasiopyga), as they properly represent a distinct genus, Ery- 

 THROCEBUS. The first group treated is the Diana under the 

 subgenus Pogonocebus with two species diana and roloway, 

 with a general description of the two forms and a Key ; also a 

 short list of synonymy. Similar treatment is given to all the 

 group except the Patas. The Neglectus group has but two 

 species, C. brazzce-formes Pocock, = L. brazz^ (A. Milne- 

 Edw.) ; and L. neglecta (Schlegel) ; L. brazz^e (Milne- 

 Edw.), being considered a synonym of the last species, S 

 conclusion not accepted by the present writer. The next is the 

 Leucampyx group under the subgenus Diademia Reich., with 

 three species and seven subspecies, the latter established in a 

 great measure because the Author's material was insufficient 

 to indicate the proper rank they should have. The species are 

 L. KANDTi ; L. opisTHOSTiCTA ; L. leucampyx, and L. nigri- 

 GENis as a subspecies ; L. doggetti first described ; L. leu- 

 campyx; (C) stuhlmanni (nee Matschie), = L. princeps 

 (Elliot); L. carruthersi first described; L. pluto; and L. 

 boutourlini. a Key and descriptions are given. The Nic- 

 titans group has but two species, and one subspecies : L. nic- 

 titans ; L. n. laglazei first described ; and L. martini. The 

 Albigularis group contains eight species : L. albigularis ; L. 

 KOLBi ; L. MOLONEYi ; L. stairsi ; L. RUFiTiNCTA first de- 

 scribed ; L. FRANCESCO ; L. preussi ; L. labiata, and five sub- 

 species : L. beirensis ; L. rufilatus ; L. albitorquata ; L. 



