Euschistus (Euschistus) sulcacitus Rolston 1971

(Figs 4, 15–17, 25, 36–38, 54–56, 63)

Male genitalia: Pygophore rectangular. Dorsal rim concave somewhat quadrate in dorsal view (Fig. 15); median projection of dorsal rim long, sinuosity deep. Ventral rim concave, slightly irregularly excavated medially in ventral view (Fig. 17); superior layer of ventral rim excavated, V-shaped in posterior view (Fig. 16). Paramere: margin connecting basal and apical process slightly concave; apical process rounded apically; middle process not developed (Fig. 25).

Female genitalia: Posterior margin of gonocoxites VIII concave, posterolateral margin of gonocoxites VIII projected posteriorly, surpassing middle of gonocoxites IX. Gonocoxites IX wider than long, lateral margins strongly rounded; anterior and posterior margins of gonocoxites IX straight (Fig. 54). Posterior region of ductus receptaculi proximalis straight, not dilated. Ductus receptaculi distalis dilated adjacent to anterior annular flange. Pars intermedialis membranous apically (Fig. 63).