Helochares (Hydrobaticus) nipponicus Hebauer, 1995

(Figs. 15–16, 22)

Helochares striatus Sharp, 1873: 60 .

Helochares (Hydrobaticus) nipponicus Hebauer, 1995: 6 .

Material examined: 7 exs. (IAECAS): Jilin Province, Baishan City, Baoquanshan Town, Bapandao Village, 2017.07.02, 41°29’35”N, 127°34’7”E, 962 m, leg. Peng.

Diagnosis. Habitus as in Figs. 15–16. BL: 4.8–5.0 mm, BW: 2.5–2.8 mm. Body oval, moderately convex. Head and pronotum dark brown, elytra, ventral side and apex of tarsal claws black. Clypeus dark brown, broad; anterior margin broadly emarginate; frontoclypeal suture distinct; a pair of splayed black marks on frons. Pronotum with a dark mark near anterior margin medially. Elytra widest at midpoint, then slightly attenuated posteriorly. Strial punctures distinctly recognized, and interstrial punctures dense which smaller than the strial punctures.

Aedeagus (Fig. 22) 1.0 mm long, strongly narrowed in distal 1/3. Basal piece short, about 0.3-times of aedeagus length. Parameres with long spines crossing or nearly crossing at apex (Fig. 22a). Median lobe broadly membranous, accompanied with a medial sea anemone-like structure (Fig. 22b).

Distribution. China: Jilin (new record species to China); Japan; South Korea.