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Genus Enicospilus

Wasp ID - Enicospilus purgatus which Ichneumon Wasp? - Enicospilus purgatus Ichneumon wasp maybe - Enicospilus purgatus - female Subfamily Ophioninae? - Enicospilus purgatus Enicospilus purgatus - female Unidentified Wasp - Enicospilus Ichneumonidae - Enicospilus Enicospilus peigleri - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitoid Apocrita))
Superfamily Ichneumonoidea (Braconid and Ichneumonid Wasps)
Family Ichneumonidae (Ichneumonid Wasps)
Subfamily Ophioninae (Short-tailed Ichneumonid Wasps)
Genus Enicospilus
Nearctica lists 12 species. There are about 700 described species
Some diagnostic characters for genus Enicospilus (cf. key and figures 16 & 25 in Broad(2006), and reference images here) are:
the discosubmarginal cell (horsehead-shaped cell below the leading wing edge) extends beyond vein 2m-cu;
transparent oval (inside discosubmarginal cell) in the otherwise papillate wing [note at least some Enicospilus spp. have two spots in this oval];
adventitious (or "spurious") vein in cell 3Cu, parallel to the wing margin.
A (fairly old) key to species of Enicospilus appears on pg. 57 of Hooker(1912).
See Also
Ophion can be superficially similar.
Note the difference in wing venation:

Print References
Broad, Gavin (2006). Identification key to the subfamilies of Ichneumonidae (Hymenoptera). Biol. Records Center, CEH Monks Wood, UK. (download as PDF).
Gauld, I.D. (1988). The species of the Enicospilus americanus complex (Hymenoptera: Ichneumonidae) in eastern North America. Systematic Entomology 13:31-53.
Hooker, Charles W. (1912). The Ichneumon flies of America belonging to the tribe Ophionini. Trans. Am. Ent. Soc. 38:1-176. (Full Text)
Internet References
Species info page from North Carolina State Univ.