When, however, we pass southwards of the delta of the Niger and arrive at the higher ground of the Cameroons the typical C. dorsalis seems to be replaced by a slightly different local form, which Thomas in 1892 characterized as a subspecies, C. dorsalis castaneus. This Antelope is rather larger than the typical form and the ears are apparently rather larger. The chestnut superciliary stripe is indistinct, far less bright than in the typical form, and the general colour of the head is darker and duller. The typical specimen of this subspecies, which is in the collection of the British Museum, is a female obtained by Crossley in the Cameroons. Besides the colour-differences just mentioned the form of the skull, which is figured in the ‘Hand-list of Ruminants’ as that of C. badius (op. cit. pl. xxx. fig. 1), is likewise peculiar. But further specimens and more information are necessary before we can decide whether it will be advisable to give the Cameroons animal the full rank of a species.
We have already mentioned the existence of a living specimen of this Duiker in the Derby Menagerie. Living specimens of it have also been received on more than one occasion by the Zoological Society of London. In 1861 an example was purchased of a dealer in Liverpool and lived more than two years in the Society’s Gardens. A second specimen, quite immature on its arrival, was purchased in February 1866 and was shortly afterwards described by Gray as Cephalophus breviceps. This was a female, and, being placed in the same compartment of the Gazelle-sheds as a male of the allied species C. rufilatus, bred with it when adult. It produced a young one in January, 1869, and died soon afterwards. A third specimen of the same Antelope was brought home from the Gold Coast and presented to the Society by Mr. C. B. Mosse, Staff-Surgeon, R.N., in October, 1869. This specimen was figured in the Zoological Society’s ‘Proceedings’ for that year (op. cit. pi. xlvi.). Mr. Mosse presented another from the same district in 1874. Since that period six other specimens of this Antelope have been acquired at different dates.
May, 1895.
27. OGILBY’S DUIKER.
CEPHALOPHUS OGILBYI, Waterh.
[PLATE XVIII. Fig. 2.]
Antilope ogilbyi, Waterh. P. Z. S. 1838, p. 60, 1842, p. 129 (Fernando Po); id. Ann. Mag. N. H. (1) ii. p. 472 (1839), xii. p. 57 (1843); Fraser, Zool. Typ. pi. xix. (animal) (1849).
Cephalophorus ogilbyi, Gray, Ann. Mag. N. H. x. p. 267 (1842); id. List Mamm. B. M. p. 163 (1843).
Antilope (Tragelaphus) ogilbyi, Less. N. Tabl. R. A., Mamm. p. 181 (1842).
Antilope (Cephalophus) ogilbyi, Wagn. Schr. Säug. Suppl. iv. p. 446 (1844), v. p. 423 (1855).
Cephalophus ogilbyi, Gray, Ann. Mag. N. H. (1) xviii. p. 165 (1846); id. Knowsl. Men. p. 10, pl. viii. fig. 2 (1850); id. P. Z. S. 1850, p. 122; id. Cat. Ung. B. M. p. 83 (1852); Temm. Esq. Zool. Guin. pp. 194, 217 (1853); Gerr. Cat. Bones Mamm. B. M. p. 236 (1862); Fitz. SB. Wien, lix. pt. 1, p. 167 (1869); Gray, P. Z. S. 1871, p. 595; id. Cat. Rum. B. M. p. 26 (1872); id. Hand-l. Rum. B. M. p. 98 (1873); Jent. N. L. M. x. p. 20 (1887) (Liberia); Büttikofer, Reisebild. Liberia, ii. p. 377 (1890); Matsch. Arch. f. Nat. 1891, pt. i. p. 353 (Cameroons); Jent. Cat. Mamm. Leyd. Mus. (Mus. Pays-Bas, xi.) p. 162 (1892); Thos. P. Z. S. 1892, p. 422; Lyd. Horns and Hoofs, p. 211 (1893); Matsch. MT. deutsch. Schutz-geb. vi. p. 81 (1893).
Sylvicapra ogilbyi, Sund. Pecora, K. Vet.-Ak. Hand-l. 1844, p. 191 (1846); id. Hornschuch’s Transl., Arch. Skand. Beitr. ii. p. 143; Reprint, p. 67 (1848).