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Subfamily Microgastrinae

Fuzzy Egg sack Braconid parasitoid of Coptotriche castaneaeella - female wasp Wasp - female Black wasp Sphinx moth caterpillar - Cotesia Unknown Braconid Wasp Predator of American Lady caterpillar
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitic Apocrita))
Superfamily Ichneumonoidea (Braconids and Ichneumons)
Family Braconidae (Braconid Wasps)
Subfamily Microgastrinae
2,000 described species in the world. Estimated total: 5,000–10,000. In the Nearctic, 299 spp.
1-4 mm generally.
Exactly 18 antennal segments (Scape, pedicel, and 16 flagellomeres; in some microgastrines, some segments appear subdivided)
Spiracles of first metasomal segment situated on lateral tergite rather than medial tergite
Larvae are parasitoids of various Lepidoptera larvae.
Cotesia is the most common genus of Microgastrinae. Acta Zoologica

Females of this subfamily inject POLYDNAVIRUSES into the host during oviposition. These virus particles compromise the host immune system, protecting the parasitoid progeny. Click here for more information on this fascinating example of mutualism.
Print References
Muesebeck, C. F. W. (1922). A revision of the North American Ichneumon-flies belonging to the subfamilies Neoneurinae and Microgasterinae. Proc. U.S. Nat. Mus. 61(15): 1-76 (Full Text)

Internet References
1st page of Microgastrinae entry from the 1979 "Catalog of Hymenoptera of America north of Mexico(1)" (AKA "the Red Book"). Some of the nomenclature may be outdated, but nevertheless a useful reference (especially for hunting down synonymy & literature for various taxa).
Works Cited
1.Catalog of Hymenoptera in America North of Mexico
Karl V. Krombein, Paul D. Hurd, Jr., David R. Smith, and B. D. Burks. 1979. Smithsonian Institution Press.