Some forms have long white whiskers associated with a blackish or dark red belly. The nasal spot may be white, red, or blue.
Some forms have white or buff stripes on the thighs.
The upper parts are often greenish gray, but browns, grays, and intermediate shades are the common colors. The color of underparts also varies considerably. The skin of part of the face in some forms is blue or violet. Guenons are also quite variable cranially. Cheek pouches are present.