Abstract

The face fly, Musca autumnalis DeGeer, was first noticed in North America about 1952. The exact date of its introduction into North America from Europe is unknown. It is not known whether it carried with it any natural parasites, but at least none were noted at the time. Blickle (1961) has reported 3 species of parasitic Hymenoptera attacking face fly pupae in New hampshire. Benson and Wingo (1963) found 1 of the 3, Aphaereta pallipes (Say), in face fly larvae and pupae in Missouri. Though it was ony species of the 3 that they found in appreciable numbers, it did not emerge normally from the puparia.

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