Hydnobius, : HATCH, 1929

Hoshina, Hideto, 2012, Review of the tribes Sogdini and Leiodini from Japan and North Chishima Islands. Part II. Genera Hydnobius and Leiodes (Coleoptera: Leiodidae), Acta Entomologica Musei Nationalis Pragae (suppl. 1) 52, pp. 1-168 : 7

Key to species of Hydnobius in Japan and North Chishima Islands

1. Body length 2.5–3.0 mm, body ca. 1.9× as long as wide ( Fig. 2A ); male metafemora bearing a large toothed projection ( Fig. 2E ); female abdominal sternite 8 bearing a robust spiculum ventrale at anterior margin ( Fig. 3C ). ................................................................. ........................................................................ 1. H. akitsuensis Hoshina & Sunada, 2003

– Body length 2.1–2.4 mm, body ca. 1.7× as long as wide ( Fig. 4A ); male metafemora bearing a small toothed projection ( Fig. 4E ); female abdominal sternite 8 with a thin spiculum ventrale at anterior margin ( Fig. 5C ). ........................................... 2. H. enomotoi sp. nov.

Figures

Fig. 2. Hydnobius akitsuensis Hoshina & Sunada, 2003.A – body, dorsal view; B – ditto, lateral view; C – head; D – antenna; E – male hind leg; F – female hind leg. Scale I: 1 mm for A and B; II: 0.5 mm for C; III: 0.5 mm for D; IV: 0.5 mm for E and F.

Fig.3.Hydnobius akitsuensis Hoshina & Sunada, 2003.A – aedeagus, dorsal view; B – ditto, lateral view; C – female abdominal sternite 8; D – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.2 mm for C and 0.1 mm for D.

Fig.4. Hydnobius enomotoi sp. nov.A – body, dorsal view; B – ditto, lateral view; C – head;D – antenna; E – male hind leg; F – female hind leg. Scale I: 1 mm for A and B; II: 0.5 mm for C; III: 0.5 mm for D; IV: 0.5 mm for E and F.

Fig. 5. Hydnobius enomotoi sp. nov.A – aedeagus, dorsal view; B – ditto, lateral view; C – female abdominal sternite 8; D – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.2 mm for C and 0.1 mm for D.