The parotid gland of the tufted capuchin monkey (Cebus apella) was examined by scanning and transmission electron microscopy. In general the ultrastructural morphology of this gland appears similar to that described in spider and squirrel monkeys. This study has established that the gland is serous. Acinar cells, which contain a well developed granular endoplasmic reticulum and a prominent GOLGI complex, produce a single secretory material. Myoepithelial cells are present around acini and around intercalated ducts. The intercalated ducts, which are composed of cells that show no evidence of secretory activity, lead into striated ducts.