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Subfamily Eucoilinae

Tiny blackish Wasp with reduced wing veneration and orange-tan extremities. Hymenoptera Gall Wasp Tiny Wasp Figitidae, the wasp in front - female Tiny wasp Another Small Trapped Tent Wasp Eucoilin from Malaise trap
Classification
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
Numbers
Nearctica lists 15 genera.
Identification
The raised, teardrop-shape on the dorsal surface of the thorax (=mesosoma) is characteristic of Eucoiliinae. (comment by Andy Boring here)
Remarks
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.