254 MB. p. 1. SCLATEB OK THE [Mar. 14, 



27. CeECOPITHECUS EEXXEBEJfl. 



Cercojjithecus erxhhenii, Puch. Eev. etMag. 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 last 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 erxlebeni, which is without the black stripe on 

 the lower back. 



28. Cebcopithecfs pogontas. 



Cercopithecus pogonias, Benn. P. Z. S. 1833, p. 67 ; Wagn. Saug. 

 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, Fraser). 



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

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

 aiid three other specimens in the British Museum. 



29. CeECOPITHECUS JflGEIPES. 



Cercopithecus niqripes, Du Chaillu, Proc. Bost. IN". H. Soc. vii. 

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



Cercopithecus pogonias, Schl. Mus. P.-B. Simice, p. 82. 



Hab. Gaboon (Du Chaillu). 



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

 broader and less well defined (Miis. Brit.). 



Sect. r. Cercopifheci barbati. 



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. brazzce, which may be dis- 

 tinguished as follows : — 



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

 \Kose hairy; frontal crest red 31. hrazza. 



30. CeECOPITHECUS DIA^TA. 



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



Cercopithecus diana, Erxleb. Syst. E.egn. An. p. 30 (1777) 

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

 Wagn. Saug. Suppl. v. p. 48 (1855) ; Gray, P. Z. S. 1868, 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, Notes L. M. x 

 p. 12 (Liberia). 



Hab. Delta of Niger (Fraser) ; Gold Coast (Pel) ; Niger 

 (^Fraser) ; Liberia (Biittikofer). 



