Numbers
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))
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)
Identification
"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)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.
