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Chrysochus auratus
Adult dogbane beetles are iridescent blue-green beetles with copper-colored shine on their front wings.
Woodland Trail
According to Animal Diversity Web, http://animaldiversity.org/accounts/Chry..., "Dogbane beetles eat and live on dogbane plants (Apocynaceae), specifically Indian hemp (Apocynum cannabinum) and spreading dogbane (A. androsaemifolium). They also occasionally live and feed on milkweed plants (Asclepiadaceae)."