All rights reserved. This document may be used, with this header included, for noncommercial purposes within a subscribed institution . No copies of this work may be distributed electronically outside of the subscribed institution, in whole or in part, without written permission from the JHU Press . 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.