Fig. 4 in A New Species of the Genus Hydrovatus Motschulsky (Coleoptera: Dytiscidae) from Japan

Fig. 4. Male genitalia and antennae of Hydrovatus species. A–D) H. onigiri, new species, E) H. subtilis. A, E) Male antenna, B) Penis, dorsal view, C) Penis, lateral view, D) Paramere. Scale bars = 0.5 mm, top scale is for male genitalia and bottom scale is for antennae.