"_Colobus kirkii_," writes Mr. H. H. Johnston, in 1886, "had disappeared from nearly every part of the island of Zanzibar, but a rumour prevailed that it still lingered on a clump of forest as yet unvisited by hunters. Thither Sir John sent his _chasseurs_ to report on the Monkey's existence. After a week's absence they returned, triumph illumining their swarthy lineaments. 'Well, did you find them?' asked the British Consul General. 'Yes,' replied the men with glee, 'and we killed them every one!' wherewith twelve Monkey-corpses were flung upon the floor, and _Colobus kirki_ joined the Dodo, the Auk, the Rhytina and the Moa, in the limbo of species extinguished by the act of man." PLATE XXXIII. [Illustration: BAY GUEREZA.] {91}IV. THE BAY GUEREZA. COLOBUS FERRUGINEUS. (_Plate XXXIII._) _Simia ferruginea_, Shaw, Gen. Zool., i., p. 59 (1800); Desm., Mamm., p. 53 (1820); Fischer, Synops. Mamm., p. 13 (1829). _Colobus ferrugineus_, Illiger, Prodr. Syst. Mamm., p. 69 (1811); Gervais, H. N. Mamm., i., p. 66 (1854); Gray, P. Z. S., 1868, p. 181; Schl., Mus. Pays-Bas, vii., p. 27 (1876); Rochebr., Faun. Sénég., Mamm., p. 25 (1883-5); Sclater, P. Z. S., 1890, p. 590, pl. xlviii. _Colobus ferruginosus_, Geoffr., Ann. Mus., xix., p. 92 (1812); Martin, Mammif. Anim., p. 498 (1841). _Colobus temminckii_, Kuhl, Beitr., Zool., p. 7 (1820); Desm., Mamm., p. 53 (1820); Ogilby, P. Z. S., 1835, p. 99; Martin, _op. cit._, p. 499 (1841). _Colobus pennantii_, Waterh., P. Z. S., 1838, p. 57; Martin, op. cit., p. 501; Geoffr., Dict. H. N., iv., p. 209 (1849); Gray, P. Z. S., 1868, p. 181, var. 2. _Colobus ferruginea_, Less., Spec. Mamm., p. 68 (1840); Gray, Cat. Monkeys Brit. Mus., p. 18 (1870). _Colobus fuliginosus_, Ogilby, Cat. Mamm. Z. S., p. 97 (1839); Is. Geoffr., Cat. Méth. Prim., p. 17 (1851); Temm., Esquiss. Zool., p. 24 (1853); Dahlb., Consp. Mamm. p. 95 (1857). _Colobus rufo-fuliginosus_, Ogilby, Cat. Mamm. Z. S., p. 270 (1839). _Colobus rufo-niger_, Ogilby, Cat. Mamm. Z. S., p. 273 (1839); Martin, _op. cit._, p. 500 (1841); Gray, P. Z. S., 1868, p. 181, var. 1. _Piliocolobus ferrugineus_, Rochebr., Faun. Sénég., Mamm. Suppl., p. 105, pl. iii. (1887). {92}_Piliocolobus bouvieri_, Rochebr., _tom. cit._, p. 108, pl. iv. _Piliocolobus tholloni_, Rochebr., _tom. cit._, p. 110, pl. v.