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Show 1893.] MONKEYS OF T H E GENUS CERCOPITHECUS. 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. CERCOPITHECUS NEGLECTUS. Cercopithecus leucocampyx, Gray, Cat. Monk. p. 22. Cercopithecus neglectus, Schleg. Mus. P.-B. Sim. p. 70. Hab. White Nile (Petherick). This is a very distinct species, founded by Sehlegel 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 like it is in C. diana. 26. CERCOPITHECUS LEUCAMPYX. Biane femelle (Cercopithecus diana), F. Cuv. Mamm. i. pi. 16. Simia leucampyx, Fisch. 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; Sci. P. Z. S. 1870, p. 670, 1871, p. 36, et 1892, p. 97 (Nyasaland). Cercopithecus diadematus, Geoffr. in Belang. Vov., Zool. n. 51 (1834). & J F Cercopithecus leucampyx, Martin, M . An. p. 529 ; Geoffr. Diet. univ. d'Hist. nat. iii. p. 304 ; Schleg. Mus. P.-B. vii. p. 83 (1876); Wagn. Siiug. v. p. 48. Hab. Angola and Congo (Mus. Lugd.) ; Nyassaland (Sharpe). W e have hitherto been in the habit of calling this well-marked species of Monkey Cercopithecus pluto. But, as pointed out by Sehlegel, it is certainly entitled to bear the name leucampyx of Fischer, which was 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. E. Cercopitheci auriculati. Of this section of the genus Cercopithecus, which 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. erxlebeni. a. Dorso postico nigro. | Dorsi fascia angustiore, definita 28. pogonias. {Dorsi fascia latiore, confluente 29. nigripes PROC. ZOOL. Soc-1893. No. XVIII. 18 |