Genus Sternolophus Solier, 1834

(Figs. 2 D–E, 51B, 60–63, 64D, 65D)

Diagnosis. Larvae of this genus are distinguished from other Japanese Hydrophilini by the following combination of characters: (1) frontal lines V-shaped (Fig. 62A); (2) nasale with distinct teeth (Figs. 60C, 62B); (3) epistomal lobes rounded, projecting as far as or only slightly further than nasale (Figs. 60C, 62B); (4) mandibles symmetrical, with two large and one small inner teeth (Figs. 61 B–C, 63C–D); (5) abdominal segments with rather short setiferous projections on each side (Fig. 51B).