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For the United States & Canada
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Tribe Gravenhorstiini

Ichneumon - Barylypa - male Therion sp.? - Therion petiolatum - female UnIdentified Thread-waisted Wasp? Therion? - Therion circumflexum - female wasp - Therion morio - female Idaho Anomaloninae - male Genus Therion? - Therion circumflexum large ichneumon wasp
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 Ichneumonoidea (Braconid and Ichneumonid Wasps)
Family Ichneumonidae (Ichneumonid Wasps)
Subfamily Anomaloninae
Tribe Gravenhorstiini
Synonyms and other taxonomic changes
Gravenhorstini (alternative spelling)
Explanation of Names
Gravenhorstiini Enderlein, 1912
named after Johann Ludwig Christian Carl Gravenhorst, a prominent German entomologist and specialist in Ichneumonidae
about 70 spp. in 16 genera in our area reported by Carlson(1); further revised by Dasch (1984)(2) to 185 spp. in the 16 genera reported in Nearctica(3)
1. Agrypon (40 spp.)
2. Aphanistes (25 spp.)
3. Barylypa (34 spp.)
4. Calcaneum (1 sp.)
5. Corsoncus (2 spp.)
6. Erigorgus (27 spp.)
7. Gravenhorstia (2 spp.)
8. Habronyx (14 spp.)
9. Heteropelma (1 sp,)
10. Liopterna (1 sp.)
11. Metoa (9 spp.)
12. Ophionellus (6 spp.)
13. Ophiopterus (1 sp.)
14. Parania (4 spp.)
15. Therion (12 spp.)
16. Trichomma (6 spp.)
Fore wing with areolet open or closed; if open, then remaining vein basal, opposite, or apical to vein 2m-cu by less than two-fifths length of remaining vein. Head in dorsal view with lateral ocellus separated from occipital carina by less than its largest diameter and occipital carina approximately level with ocellus (4).

Wing venation of Therion
Works Cited
1.Carlson R.W. () Ichneumonidae catalog
2.Ichneumon-flies of America north of Mexico: 9. Subfamilies Theriinae and Anomaloninae
Clement E. Dasch. 1984. Memoirs of the American Entomological Institute, no. 36: 1-610.
3.Nomina Insecta Nearctica
Poole, Robert W., Inc.
4.Hymenoptera of the world: an identification guide to families
Goulet H., Huber J., eds. 1993. Agriculture Canada Publication 1894/E. 668 pp.