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Species Euschistus tristigmus - Dusky Stink Bug

Euschistus tristigmus Insect ID Request - Euschistus tristigmus Another stink bug - Euschistus tristigmus Stink Bug Nymph - Euschistus tristigmus Red-shouldered Stink Bug - Dorsal - Euschistus tristigmus Stink Bugs - Euschistus tristigmus - male - female Dusky Stink Bug - Euschistus tristigmus Unknown Stink Bug - Euschistus tristigmus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Pentatomoidea
Family Pentatomidae (Stink Bugs)
Subfamily Pentatominae
Tribe Carpocorini
Genus Euschistus
Species tristigmus (Dusky Stink Bug)
Explanation of Names
Euschistus tristigmus (Say 1832)
tristigmus = 'three-spotted' (refers to the dark spots on the abdominal venter)
3 forms exist, usually treated as subspecies(1)
E. t. tristigmus 8.0-11.0 mm, E. t. luridus 10.0-12.0 mm(1)
Abdomen ventrally with 1-4 black spots down midline (spots obsolete in some individuals)(2):

highly variable, often impossible to tell apart from E. servus from above
E. t. luridus is more northern and has the humeri rounded, in the nominate ssp. (se. US) humeri are acute to spinose(2)
E. t. luridus northern transcontinental, E. t. tristigmus in se. US(2)(1)
extremely polyphagous(1); occasionally predaceous(3)
See Also

Podisus maculiventris
Print References
McPherson J.E. (1975) Life history of Euschistus tristigmus tristigmus (Hemiptera: Pentatomidae) with information on adult seasonal dimorphism. Ann. Ent. Soc. Am. 68: 333-334.
Internet References
E. t. luridus taxon page (4)
Works Cited
1.The Pentatomoidea (Hemiptera) of Northeastern North America
J.E. McPherson. 1982. Southern Illinois University Press.
2.The Heteroptera (Hemiptera) of North Dakota I: Pentatomomorpha: Pentatomoidea
Rider D.A. 2012. Great Lakes Entomologist 45: 312-380.
3.An updated synopsis of the Pentatomoidea (Heteroptera) of Michigan
Swanson D.R. 2012. Great Lakes Entomologist 45: 263-311.
4.University of Alberta Entomology Collection