Key to the Far Eastern species of the subgenus Agostenus Fischer von Waldheim, 1829, genus Chlaenius Bonelli, 1810

1. Even intervals of elytra more densely punctured, with denser yellow pubescence; odd intervals with less dense black hairs; suture elevated and shining (Figs 16–18). Unicolour black with slight bronze tint. Length 14–18 mm ................... …............................................................................. Chlaenius quadrisulcatus

- All intervals of elytra with dense wrinkled punctures and uniform yellow or grey pubescence; elytral suture neither elevated nor shining (Figs 13–15).................................................................................. 2

2. Prosternal process not bordered and punctured. Larger (length 13–15 mm) and wider. Head without green sheen (Figs 14–15) Chlaenius sulcicollis

- Prosternal process distinctly bordered and smooth. Smaller (length 12–13 mm) and narrower. Head often with green or copper sheen (Figs 13)...................................................................... Chlaenius alutaceus