Chapter IV: 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_.