Three new species and two new records of Helochares (Hydrobaticus) MacLeay 1871 from China (Coleoptera: Hydrophilidae: Acidocerinae) Author Dong, Xue 0000-0003-0006-6344 CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China dx _ dongxue @ 163. com; https: // orcid. org / 0000 - 0003 - 0006 - 6344 Author Bian, Dongju 0000-0003-0006-6344 CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China dx _ dongxue @ 163. com; https: // orcid. org / 0000 - 0003 - 0006 - 6344 text Zootaxa 2021 2021-03-29 4950 1 166 180 journal article 7490 10.11646/zootaxa.4950.1.9 08e1a467-c7d1-4aa4-a63b-1e5d6e83bd17 1175-5326 4643595 9D4DA78E-15BC-40D2-9F71-863396CB8402 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 .