this article has info on many intergeneric hybrids, including quite a few between Macaca and Cercocebus, Papio and Mandrillus. Surprised me I must say.
http://digitallibrary.amnh.org/dspa...ace/ingest/pdfSource/nov/N2635.pdf?sequence=1
http://digitallibrary.amnh.org/dspa...ace/ingest/pdfSource/nov/N2635.pdf?sequence=1