Euschistus (Euschistus) corcovacitus Rolston, 1971

(Figs 1, 6–8, 22, 27–29, 45–47, 60)

Male genitalia: Pygophore trapezoidal. Dorsal rim uniformly concave in dorsal view (Fig. 6); extension of dorsal rim long, sinuosity deep; superior process of dorsal rim tooth-like. Ventral rim slightly sinuose, convex medially in ventral view (Fig. 8). In posterior view, ventral rim protuberant mesially (Fig. 7). Paramere: margin connecting basal and apical processes deeply concave; apical process somewhat truncate at apex; middle process not developed (Fig. 22).

Female genitalia: Posterior margin of gonocoxites VIII concave; posterolateral margin of gonocoxites VIII projected posteriorly, surpassing middle of gonocoxites IX. Gonocoxites IX at least three times wider than long; posterior margin of gonocoxites IX slightly concave; postero-lateral angles slightly acute (Fig. 45). Laterotergites IX surpassing dorsal band that unites laterotergites VIII in posteroventral view. Distal region of ductus receptaculi proximalis dilated. Basal three-fourths of pars intermedialis sclerotized (Fig. 60).