Couplet 5.
Sternaulus represented by two, parallel, distinctly sculptured grooves (Figs. 1 and 2: arrows)
Sternaulus either absent (Fig. 1) or represented by a single groove that is either sculptured (Fig. 2: arrow) or unsculptured (Fig. 3) (Subfamilies Opiinae and Braconinae)
future couplets