Length: 8.5 - 10.5 mm
Coenus delius is unique among Stink Bugs in northeastern North America by its being wider at the middle than at either end, by its being convex above and convex below, by a head that is wider than long, by the tylus being markedly elevated above the juga, and by the rounded, long scutellum (McPherson, 1982).
Coenus delius is the only species in the genus found in the northern United States and in Canada. The only other Nearctic member of the genus is Coenus inermis, not described until 1936, which lives in the southeastern United States. (Some sources list a third, rare, species that is also found in the southeast, Coenus explanatus.)
The great entomologist E. P. Van Duzee in the late nineteenth century encountered "a dozen or more individuals gathered on a bruised sweet apple, the juice of which they were eagerly imbibing" (quoted in Blatchley, 1926).
Other early writers reported Coenus delius in fields of Timothy grass, blue grass, and clover. C. E. Olsen kept adults of this species for two months, providing moth mullein for their food.
Coenus delius has one generation per year and overwinters in the adult stage.
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