Key to the species of the aokii group

1 Pronotum moderately narrow. Elytra distinctly broader than long, strongly broadened apicad. Punctation of head and pronotum very fine and sparse. Apical portion of median lobe narrow, preapical portion with slightly concave lateral margins (Fig. 43). Body dark brown to reddish brown, without elytral spots. Body length: 3.6–4.8 mm. Japan (Hokkaido)........... G. aokii

- Pronotum distinctly transverse. Elytra slightly longer than broad, slightly broadened apicad. Punctation of head and pronotum moderately coarse and dense. Apical portion of median lobe moderately wide, preapical portion with widely concave lateral margins (Fig. 41). Body black, with a long oblique spot on each elytron. Body length: 4.0– 4.8 mm. Japan (Honshu)................................................................................................... G. sprius