A new species of Hydrochara Berthold from China (Coleoptera, Hydrophilidae, Hydrophilini) Author Mai, Zuqi Life Sciences School, Sun Yat-sen University, Guangzhou, 510275, Guangdong, China & Faculty of Environmental Sciences, Department of Ecology, Czech University of Life Sciences Prague, Czech Author Jia, Fenglong 0000-0003-2391-5038 Life Sciences School, Sun Yat-sen University, Guangzhou, 510275, Guangdong, China lssjfl@mail.sysu.edu.cn text Zootaxa 2024 2024-05-21 5453 3 359 368 http://dx.doi.org/10.11646/zootaxa.5453.3.3 journal article 10.11646/zootaxa.5453.3.3 1175-5326 11234072 FAB7B658-47B0-4507-8D91-1ACC8DB03EAE A key to Chinese species of the genus Hydrochara Berthold 1. Prosternum with a long acute spine posteriorly...................................... H. dichroma (Fairmaire, 1892) - Prosternum without long acute spine posteriorly............................................................. 2 2. Lateral rim of elytra relatively wide, wider than diameter of the serial punctures near base of elytron. Legs reddish black to black............................................................................................... 3 - Lateral rim of elytra narrow, not wider than diameter of the serial punctures near base of elytron. Legs yellowish to reddish brown.............................................................................................. 4 3. Maxillary palps yellowish to reddish brown, not paler at the apical portion of each segment ( Fig. 4A ). Intervals of systematic punctures with 1–2 rows of vaguely impressed fine punctures ( Fig. 4C ). Aedeagus with lateral margins of parameres straight medially; gonopore oval ( Fig. 3C ). Body length 21.5–23.5 mm .................................... H. loong sp. nov. - Maxillary palps dark piceous with apical portion of each segment slightly paler ( Fig. 4B ). Intervals of systematic punctures with 1–2 distinct rows of fine punctures ( Fig. 4D ). Aedeagus with lateral margins of parameres sinuate or slightly concave medially; gonopore triangular ( Fig. 3D ). Body length 14.0–17.5...................................... H. libera (Sharp, 1884) 4. Parameres of aedeagus with apices angulately produced inwards. Body length 12.5–18 mm ........ H. affinis (Sharp, 1873) - Parameres of aedeagus with apices not angulately produced inwards. Body length 11.0– 16.5 mm .. H. flavipes (Steven, 1808)