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Subfamily Eucoilinae

Small Wasp Chalcid? Figitid? parasitoid of Nemorimyza posticata - Zaeucoila robusta Ant or Wasp? Figitid ex agromyzid ex Melampyrum lineare - Zaeucoila robusta Figitid ex agromyzid on Solidago patula - Gronotoma Figitid ex Nemorimyza posticata Figitidae, Eucoilinae?
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" - Parasitoid Wasps)
Superfamily Cynipoidea
Family Figitidae
Subfamily Eucoilinae
Nearctica lists 15 genera.
The raised, teardrop-shape on the dorsal surface of the thorax (=mesosoma) is characteristic of Eucoiliinae. (comment by Andy Boring here)
Eucoilines are all primary koinobiont endoparasitoids of Cyclorraphous Diptera. [comment by Matt Buffington]
More simply put, they are parasites of fly pupae. (1)
Works Cited
1.Borror and DeLong's Introduction to the Study of Insects
Norman F. Johnson, Charles A. Triplehorn. 2004. Brooks Cole.