Male genitalia, including the pygophore, parameres, and inflated aedeagi, are compared between the midwestern species of Euschistus [i.e., E. ictericus (L.), E. politus Uhler, E. servus (Say) (including E. s. servus and E. s. euschistoides (Vollenhoven), E. tristigmus (Say) (including E. t. tristigmus and E. t. luridus Dallas), and E. variolarius (Palisot de Beauvois) ]. These structures differ markedly between these taxa with the exception of the two subspecies of E. servus and of E. tristigmus, thus confirming their subspecific status.