- A. Horns, when present, pointed directly backwards, in a line with, or below the line of, the nasal profile; generally present in the female. Ears moderate or short, rounded, their length much less than the distance from the eye to the nose. General colour fulvous, red, grey, or black, generally marked or striped. (Bush-Duikers.)
- a. Size large: hind foot (without hoof) more than 11 in.; basal length of skull more than 9·5.
- a1. General colour blackish, with a yellowish lumbar stripe.—W. Africa. 19. C. sylvicultrix.
- b1. General colour of body grey, of head and neck black.—W. Africa. 20. C. jentinki.
- b. Size medium or small: hind foot less than 10 in.; basal length of skull less than 8·5.
- a1. General ground-colour fulvous, rufous, or chestnut.
- a2. Back not transversely striped. No heel-tufts.
- a3. Colour quite uniform, no mesial dark markings on the face or elsewhere.
- a4. Size larger; hind foot (?hoof included) 9·5 in.—E. Africa. 21. C. spadix.
- b4. Size smaller; hind foot without hoof 7·5 in.—S.E. Africa. 22. C. natalensis.
- b3. Mesial dark markings present either on face or on back or on both.
- a4. Darker markings shining black or brown.
- a5. Back uniform rufous, no dorsal stripe.
- a6. Ground-colour pale bay, lighter below; chin white; hoofs normal.—E. Africa 23. C. harveyi.
- b6. Ground-colour dark chestnut above and below; hoofs elongated.—W.Africa 24. C. nigrifrons.
- b5. Back with a black dorsal stripe continued on to the tail.—All W. Africa.
- a6. Tail black and white; back of hams red or white.
- a7. Centre line of face decidedly darker than flanks. Dorsal line from nape.
- a8. Sternal region and back of hams white. Tail tufted at tip 25. C. leucogaster.
- b8. Sternal region and back of hams as dark as or darker than the body. Tail evenly haired, not tufted 26. C. dorsalis.
- b7. Face uniformly rufous yellow, like the flanks. Dorsal line from withers 27. C. ogilbyi.
- b6. Tail nearly wholly black; back of hams also black. 28. C. callipygus.
- b4. Darker markings bluish grey.—W. Africa. 29. C. rufilatus.
- b2. Back transversely banded. Heels with tufts.—W. Africa. 30. C. doriae.
- b1. General colour smoky brown or blackish.
- a2. Size larger; hind foot 8·25. Face more rufous than body.—W. Africa 31. C. niger.
- b2. Size smaller; hind foot less than 7·5 in. Face like back.
- a3. Legs greyish brown, like body.
- a4. Rump not particoloured.—Sierra Leone. 32. C. maxwelli.
- b4. Rump particoloured.
- a5. Belly usually lighter than back; female horned.—Cameroons; Zanzibar 33. C. melanorheus.
- b5. Belly not or little lighter than back; female hornless.—Uganda 34. C. æquatorialis.
- b3. Legs rufous; rump not particoloured.—S.E. Africa. 35. C. monticola.
- B. Horns, when present, slanting upwards at a sharp angle above the nasal profile; females normally hornless. Ears long, pointed, their length equal to or exceeding the distance from the eye to the rhinarium. General colour yellow or greyish; no darker markings on the body, but a brown nasal patch present. (True Duikers.)
- a. Size smaller: hind foot less than 9 in.; basal length of skull less than 5·5.
- a1. Colour bright yellow.—W. Africa 36. C. coronatus.
- b1. Colour grizzled greyish brown.—Abyssinia 37. C. abyssinicus.
- b. Size larger: hind foot more than 9·5 in.; basal length of skull more than 6·0.—Southern Africa 38. C. grimmi[11].
THE BOOK OF ANTELOPES, PL. XIII.
J. G. Keulemans del.
J. Smit lith.
Hanhart imp.
The Yellow-backed Duiker.
CEPHALOPHUS SYLVICULTRIX.
Published by R. H. Porter.
THE BOOK OF ANTELOPES, PL. XIV.