FIGURES 1–4. Habitus, 1–2 in Revision of the Chinese species of the genus Grouvellinus Champion, 1923 (Coleoptera: Elmidae). The G. acutus species group

FIGURES 1–4. Habitus, 1–2 dorsal and ventral view of Grouvellinus acutus sp. nov., male, holotype; 1a G. acutus sp. nov., hooked apical appendage on male hind tibia; 3–4 dorsal and ventral view of G. denticulatus sp. nov., male, holotype. Scale bar= 0.5 mm.