Stomis robustus —group

This group is characterized by the combination of: rather convex body, small head, medium to rather long mandibles, of which the right one is not notched, pronotum rather elongate, more or less convex, with a single anterolateral seta, more or less elongate elytra, shoulders without humeral tooth but sometimes angulate, aedeagus small, with very short apical lamella, depressed in the apical portion; color black, sometimes iridescent, constantly without metallic hue.

Distribution. Sichuan, Chongqing, Yunnan, Shaanxi.