Abstract
The females of this arrhenotokous species develop as internal primary parasites of Parlatoria oleae whereas the males develop adelphoparasitically on the prepupal and pupal stages of their own species. Retarded development of a portion of the female progeny is a characterictic phenomenon in the life history of the species. This ensures that the males of F2 on emerging meet unmated females of F1, and makes it possible for a single mated female to establish the species in a new area.