254 MR. p. L. scLATEH o>' THE [Mar. 14, 



27. Ceecopithects erxlebexi. 



Cercopithecus erxhhcnii, Puch. Eev. et Mag. de Zool. 1856, p. 96 ; 

 Dahlb. Zoolog. Stud. p. 109, t. v. (1856) ; Gray, P. Z. S. 1868. 

 p. 182 ; id. Cat. Monk. B. M. p. 23 (part.) ; Scl. P. Z. S. 1871, 

 p. 36 ; id. List Vert. (1883) p. 10. 



Hah. West Africa : Congo (Monteiro). 



We received our first specimen of this beautiful species in 1870, 

 since which date six others have arrived in the Society's 

 Menagerie. It is possible, however, that some of these la.st may 

 have been referable to two succeeding forms. But the three skins 

 which I exhibit (received 5/9/82, 17/7/85, and 13/10/87) all belong 

 to what I call true erxleheni, which is without the black stripe on 

 the lower back. 



28. Cercopithects pogoxias. 



Cercfjpiiliecus pogonias, Benn. P. Z. S. 1833, p. 67 ; Wagn. Saucr. 

 Suppl. V. p. 43 (1855); Gray, P. Z. S. 1868, p. 182; id. Cat. 

 Monk. B. M. p. 23 (1870). 



Hah. Fernando Po (Knapp., Thomson, Frrtsd-). 



United by Schlegel to C. erxleheni, but apparently quite distinct, 

 and at once known by the well-defined black dorsal stripe. Type 

 and three other specimens in the British Museum. 



29. Ceecopithects xi gripes. 



Cerco/nthecus nigripes, Du Chaillu, Proc. Bost. X. H. Soc. vii. 

 p. 360 (1860) ; Gray, P. Z. S. 1868, p. 182. 



C'ercojnthecus pofjonias, Schl. Mus. P.-B. Simice, p. 82. 



Hah. Gaboon (Du Chaillu). 



Like C. porjonias but darker, and the black dorsal stripe much 

 broader and less well defined {Mus. Brit.). 



Sect. P. Cercopntheci harhati. 



This section, the members of which are at once recognizable by 

 the long beard on the chin, contains only the well-known Diana 

 Monkey and the recently described C. hrazzce, which may be dis- 

 tinguished as follows : — 



f Nose naked ; frontal crest black aud white ... 30. diana. 

 \ Nose hairy ; frontal crest red 31. hrazza. 



30. Cercopithecus diaxa. 



Simia diana, Linn. Syst. Xat. i. p. 38 (1766). 



Cercojnthecus diana, Erxleb. Syst. Regn. An. p. 30 (1777) 

 Martin, M. An. p. 523 ; GeofEr. Diet. univ. d'Hist. nat. iii. p. 304 

 Wagn. Saug. Suppl. v. p. 48 (1855) ; Gray, P. Z. S. 186«, p. 182 

 id. Cat. Monk. B. M. p. 22 (1870) ; Scl. List Vert. (1883) p. 10 

 Schleg. Mus. P.-B. vii. p. 92 (1876) ; Jentink, Xotes L. M. x. 

 p. 12 (Liberia). 



Hah. Delta of Xiger (Fraser) ; Gold Coast (Pel) ; Xiger 

 (Fraser) ; Liberia (BUttikofer). 



