1893.] MOIfKEYS OP THE GBNITS CJiilCOPITHECrS. 253 



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

 Museum, which was formerly living in the Zoological Garden of 

 Rotterdam. 



25, Ceecopithecfs negiecttts. 



Cercopithecus leueocampyx. Gray, Cat. Monk. p. 22. 



Cercopithecus nerjUctus,, ^chleg. Mus. P.-B. Sim. p. 70. 



Hah. White Kile (Petherkl-). 



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. hucampysc. It is grizzly grey 

 above, and has the haunch banded something Hke it is in C. diana. 



26. Cekcopithecus lettcampxi. 



Diane femelh {Cercopitliecus diana), !F. Cuv. Mamm. i. pi. 16. 



Simia leucampyx, Fiseh. Syn. Mamm. p. 20 (1829). 



Cercopithecus pluto, Gray, P. Z. S. 1848, 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 

 (Nyasaland). 



Cercopithecus diadematus, Geoffr. in Belang. Toy., Zool. p. 51 

 (1834). 



Cercopithecus leucampy.v, 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. 



Hab. Angola and Congo (J/ms. Lugd.) ; Nyassaland (SJiarpie). 



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

 species of Monkey Cercopithecus phito. But, as pointed out by 

 Schlegel, it is certainly entitled to bear the name leucamjvjx of 

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

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

 since 1870, when our first specimen was 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 Pluto 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 difficult to understand how 

 this very distinct species could ever have been mistaken for the 

 female of the Diana Monkey. 



Sect. B. CercopAtheci auriculati. 



Of this section of the genus Cercopnthecus, w-hich is distinguished 

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

 head, three species, or what may be possibly only local subspecies, 

 are distinguishable as follows : — 



A. Dorso concolore 27. erxleheni. 



B. Dorso postico nigro. 



f Dorsi fascia angustiore, definita 28. pogonias. 



\ Dorsi laseia latiore, confluente 2^. itigripes. 



Pkoc. Zool. Soc— 1893. No. XVIII. 18 



