The identity of Nearctic Cerocephala Westwood (Hymenoptera: Pteromalidae).
The name Cerocephala rufa of American authors [see RAE/A 67, 4228], is stated to have been incorrectly applied to a Nearctic species that is actually the Palaearctic species C. eccoptogastri Masi [9, p. 419]. The Nearctic species C. dubarae Wallace [48, p. 504] is synonymised in this paper with C. rufa (Wlk.). Both C. rufa and C. eccoptogastri are now recognised as Holarctic species. A key is given for both species, their geographical distribution is summarised and known hosts are listed. C. eccoptogastri is associated with scolytids such as Scolytus multistriatus (Marsham) (as a secondary parasite) and with Dendrosoter and Spathius spp. (as a primary parasite) in the Nearctic Region, and with Scolytus rugulosus (Mull.) and S. koenigi Schevyrev in the Palaearctic Region, acting apparently both as a primary and as a secondary parasite. The true C. rufa is associated with anobiids; in the Nearctic Region it is known from Hemicoelus carinatus (Say) (Hadrobregmus carinatus) and in the Palaearctic Region from Hadrobregmus pertinax (L.) (Anobium pertinax) and A. punctatum (Deg.), possibly as a secondary parasite through the braconid Spathius exarator (L.).