The Collaborative International Dictionary of English v.0.48:

Mycetes \My*ce"tes\, n. [NL., fr. Gr. mykhth`s a bellower, fr.
   myka^sqai to bellow.] (Zool.)
   A genus of South American monkeys, including the howlers. See
   Howler, 2, and Illust.
   [1913 Webster]