1893.] MOIfKETS or the GEiS^US CERCOPITHECrS. 253 



There is a single specimen of the same species in the Leyclen 

 Museum, which was formerly living in the Zoological Garden of 

 Rotterdam. 



25. Cercopithecfs jteglectfs. 



CercopWiecus leucocampy.v., Gray, Cat. Monk. p. 22. 



Cercojnthecris neglectus, Schleg. jNFus. P.-B. Sim. p. 70. 



ITah. White Nile (Pethericl-). 



This is a very distinct species, founded by Schlegel on a single 

 flat skin in the British Museum from the White Nile, which was 

 wrongly referred by Gray to C. leucampyx. It is grizzly grey 

 above, and has the haunch banded something lilve it is in G. diana. 



26. Ceecopithecfs leucampts. 



Diane femelle {Cercopitliecus diana), Y. Cuv. Mamm. i. pi. 16, 



Simla leucainpy.v, Fisch. Syn. Mamm. p. 20 (1829). 



Cercopithems pluto, Gray,"P. Z. S. 184S, p. 56, pi. iii., et 1868, 

 p. 182; id. Cat. Monk. B. M. p. 23 (1870); Wagn. Siiug. Suppl. 

 V. p. 48; Scl P. Z. S. 1870, p. 670, 1871, p. 36, et 1892, p. 97 

 (Xyasaland). 



Cercopntliecus diademaius, Geoffr. in Belang. Yoy., Zool. p. 51 

 (1834). 



Cercopitliecus leucamp>yx, Martin, M. An. p. 529 ; Geoffr. Diet, 

 univ. d'Hist. nat. iii. p. 304 ; Schleg. Mus. P.-B. vii. p. 83 (1876) ; 

 Wagn. Saug. v. p. 48. 



Hah. Angola and Congo {Mus. Lugd.) ; Nyassaland (Sharjye). 



We have hitherto been in the habit of calling this well-marked 

 species of Monkey Cercopntliecus pluto. But, as pointed out by 

 8chlegel, it is certainly entitled to bear the name leucamj^yoc of 

 Fischer, which ^^•as bestowed upon it twenty years previously. 

 The Pluto or Diadem Monkey is certainly a rare species, although 

 since 1870, when our first specimen M'as received, we have had 

 altogether eight specimens in the Gardens. In October 1887 three 

 Pluto Monkeys arrived in the Gardens together, along with a 

 Gorilla, deposited by Cross of Liverpool. 



The Phito Monkey is at once recognizable by its conspicuous 

 white frontal band; the rest of the head and the whole of the 

 limbs and tail are black. It is rather clilTicult to understand how 

 this very distinct species could ever have been mistaken for the 

 female of the Diana Monkey. 



Sect. E. Cercopitlieci auricidaii. 



Of this section of the genus CercopitJiecus, which is distinguished 

 by its long yellowish ear-tufts and the three black lines on the 

 head, three species, or w hat may be possibly only local subspecies, 

 are distinguishable as follows : — 



A. Uorso concolore 27. crxleheni. 



B. Dorso postioo nigro. 



f Dorsi fiiscia angustiorp, tlofiiiita 28. poyoinns. 



\ Dorsi fascia latioro, confluento 2'J. vii/ripfs. 



Pnoc. Zool. Soc— 1893, No. XVIII. 18 



