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Genus Therion

Summer Wasp - Therion - female wasp - Therion - female Ichneumonidae sp - Therion Therion sp. (?) - Therion circumflexum - female Thread-waisted wasp? - Therion ichneumon wasp - Therion circumflexum - female black and orange elongated wqsp - Therion Therion petiolatum Ichneumon Wasp - Therion - male - female
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
Genus Therion
Explanation of Names
Therion Curtis, 1829-30
12 spp. in our area(1)(2)(3)(4)
1. T. circumflexum: transcontinental (Transition Zones)
2. T. fuscipenne: transcontinental (Transition Zones) (= T. confusum(4))
3. T. longipes: transcontinental (inc. CA, MD, NM, NY, PA, VT) (= T. californicum, T. varicolor(4))
4. T. magnum(4)
5. T. minutum(4)
6. T. morio: transcontinental (Transition and Upper Austroriparian Zones)
7. T. nigripes: NY, PA, NJ, MI
8. T. nigrovarium
9. T. petiolatum: ME, NY, MI, WI, SD
10. T. sassacus: NB and ON, s. to VA
11. T. tenuipes: CT, MA, NY, NC, SC
12. T. texanum: Atlantic to 100° W (Upper and Lower Austroriparian Zones)
"Therion is distinctive because of its apically truncate clypeus without a pointed projection or tooth;

small acute tooth on lower front margin of pronotum;
postpectal carina interrupted in front of each mid coxa;

postnervulus vein joining the discocubital cell nearits midlength;

and because of its modified male hind tarsi which have a weak median longitudinal carina ventrally on segments 2-4." -Charles C. Porter 1999

Key to northeastern USA species by Dreisbach (1947).(2)
New World & Eurasia(5)
Print References
Porter, C. C. (1999). First notice of Therion from South America with description of two new species from Argentina and Bolivia (Hymenoptera: Ichneumonidae). Insecta Mundi, 13(1-2), 85-91.
Works Cited
1.Carlson R.W. () Ichneumonidae catalog
2.A New Species of the Genus Therion (Hymenoptera, Ichneumonidæ) with a Key to the Species of the Northeastern States
Dreisbach, R.R. 1947. Journal of the New York Entomological Society, 55(3), 201-203.
3.Hymenoptera of America North of Mexico - Synoptic Catalog
C.F.W. Muesebeck and Karl V. Krombein. 1951. United States Department of Agriculture, Agriculture Monograph No. 2.
4.Nomina Insecta Nearctica
Poole, Robert W., Inc.
5.Genera Ichneumonorum Nearcticae (2014)