The names of two genera and eleven species belonging to Hymenoptera are unavailable. They were published by Francisco Dias da Rocha in 1908 for species from the state of Ceará (Brazil) and attributed to William H. Ashmead. The genus names proposed here as nomina nuda are: Mesopteromalus (Pteromalidae) and Rochai (Ichneumonidae). The species names proposed as nomina nuda are Trichoporus abdominalis, Tetrastichus balteativentris (Eulophidae), Eupelmus myrtaceae (Eupelmidae), Eurytoma cearae (Eurytomidae), Mesopteromalus abdominalis (Pteromalidae), Syntomaspis loranthaceae (Torymidae), Urogaster brasiliensis (Braconidae), Rochai achiaemorpha (Ichneumonidae), Leptacis myrtaceae, Polygnotus brasiliensis, and Synopeas rochai (Platygastridae). The probable relationship between Mesopteromalus abdominalis with Jaliscoa nudipennis Boucek, and between Eurytoma cearae and Rileya cearae Crawford are discussed.