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Species Euschistus tristigmus - Dusky Stink Bug

stink bug - Euschistus tristigmus Stink Bugs - Euschistus tristigmus - male - female Euschistus tristigmus tristigmus - Euschistus tristigmus Pentatomid - Euschistus tristigmus Id help needed - stink bug - Euschistus tristigmus Euschistus? - Euschistus tristigmus Dusky Stink Bug - Dorsal - Euschistus tristigmus Pentatomidae, Dusky Stink Bug, dorsal - Euschistus tristigmus
Classification
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 venter)
Numbers
3 forms exist that used to be treated as subspecies(1)
Size
E. t. tristigmus 8‒11 mm, E. t. luridus 10‒12 mm(1)
Identification
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 acute to spinose(2)
Range
transcontinental, Canada to Guatemala; in our area, BC‒NF to OR‒UT‒SD‒TX‒FL(3)
Food
extremely polyphagous(1); occasionally predaceous(4)
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.
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 Entomol. 45: 312‒380.
3.A distributional synopsis of the Pentatomidae (Heteroptera) north of Mexico, including new state and provincial records
Rider, D.A. and Swanson, D.R. 2021. Zootaxa, 5015(1), 1–69.
4.An updated synopsis of the Pentatomoidea (Heteroptera) of Michigan
Swanson D.R. 2012. Great Lakes Entomologist 45: 263-311.