_a^1._ General colour blackish, with a yellowish lumbar stripe.--W. Africa. 19. _C. sylvicultrix._ _b^1._ 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. _a^1._ General ground-colour fulvous, rufous, or chestnut. _a^2._ Back not transversely striped. No heel-tufts. _a^3._ Colour quite uniform, no mesial dark markings on the face or elsewhere. _a^4._ Size larger; hind foot (?hoof included) 9·5 in.--E. Africa. 21. _C. spadix._ _b^4._ Size smaller; hind foot without hoof 7·5 in.--S.E. Africa. 22. _C. natalensis._ _b^3._ Mesial dark markings present either on face or on back or on both. _a^4._ Darker markings shining black or brown. _a^5._ Back uniform rufous, no dorsal stripe. _a^6._ Ground-colour pale bay, lighter below; chin white; hoofs normal.--E. Africa 23. _C. harveyi._ _b^6._ Ground-colour dark chestnut above and below; hoofs elongated.--W.Africa 24. _C. nigrifrons._ _b^5._ Back with a black dorsal stripe continued on to the tail.--All W. Africa. _a^6._ Tail black and white; back of hams red or white. _a^7._ Centre line of face decidedly darker than flanks. Dorsal line from nape. _a^8._ Sternal region and back of hams white. Tail tufted at tip 25. _C. leucogaster._ _b^8._ Sternal region and back of hams as dark as or darker than the body. Tail evenly haired, not tufted 26. _C. dorsalis._ _b^7._ Face uniformly rufous yellow, like the flanks. Dorsal line from withers 27. _C. ogilbyi._ _b^6._ Tail nearly wholly black; back of hams also black. 28. _C. callipygus._ _b^4._ Darker markings bluish grey.--W. Africa. 29. _C. rufilatus._ _b^2._ Back transversely banded. Heels with tufts.--W. Africa. 30. _C. doriae._ _b^1._ General colour smoky brown or blackish. _a^2._ Size larger; hind foot 8·25. Face more rufous than body.--W. Africa 31. _C. niger._ _b^2._ Size smaller; hind foot less than 7·5 in. Face like back. _a^3._ Legs greyish brown, like body. _a^4._ Rump not particoloured.--Sierra Leone. 32. _C. maxwelli._