Published online by Cambridge University Press: 31 May 2012
Smith (Day and Smith 1980) identified mature dipteran eggs attached to the thorax of adult females of European Rhopalum clavipes (L.) (Hymenoptera: Sphecidae) as Ptychoneura minuta (Fallén) (Sarcophagidae: Miltogramminae). R. clavipes is widespread in North America (introduced) but examination of previously collected specimens, a literature search, and discussions with specialists (H. K. Townes, American Entomological Institute, Ann Arbor, Michigan and G. E. Shewell, Biosystematics Research Institute, Ottawa, Canada) indicated that this behaviour had not previously been recorded in North America.