Discovery of a New Hyperparasitoid Interaction between Anastatus mirabilis and a Dryinid Species

We report the first documented case of Anastatus mirabilis (Walsh and Riley) (Hymenoptera: Eupelmidae) acting as a hyperparasitoid of Dryinidae (Hymenoptera). Dryinid cocoons were discovered beneath the molted exuviae of flatid nymphs on walnut (Juglans) foliage collected in August 2024 from the University of Delaware campus in Newark, Delaware. Two adult female A. mirabilis emerged from these cocoons, which had been maintained under controlled laboratory conditions. Both females were subsequently observed parasitizing egg masses of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae). Identifications were made using keys to Nearctic Chalcidoidea and North American Anastatus species, with diagnostic features including two hyaline triangles on the forewings and the surface texture of the prescutum and scutellum.