Section I. (_cobus_).

Larger in size; fur grizzled; neck maned.

A. Nape uniform with back; horns lunate, inclined forwards.

a. With a white rump-band 58. C. ellipsiprymnus.

b. Without a white rump-band.

a^1. Ears shorter, rounded; eye-region not white.

a^2. General colour rufous 59. C. unctuosus.

b^2. General colour fuliginous. Back lighter 60. C. crawshayi. Back darker 61. C. penricei.

b^1. Ears longer, pointed; eye-region white 62. C. defassa.

B. Nape conspicuously white; horns serpentine, inclined backwards. 63. C. maria.