Abstract
Species of the Asian genus Eotrechus Kirkaldy, 1902 (Hemiptera, Heteroptera, Gerromorpha, Gerridae, Eotrechinae) are atypical water striders because they live on the near-vertical rock surfaces of waterfalls. The taxonomy of the genus is revised and six new species are described: E. steinerisp. nov., E. kerberossp. nov., E. thaisp. nov., E. konkakinhsp. nov., E. boukalisp. nov., and E. andersenisp. nov. Supplementary descriptions of the apterous female and macropterous male of E. fuscus Basu, Chandra & Venkatesan, 2017 are provided. Additional and updated distribution data of species of Eotrechus are reported. Eotrechus fuscus is reported from Myanmar for the first time; E. brevipes is reported from Nepal for the first time; E. hygropetricus Andersen, 1982 is reported from southern Thailand for the first time, which extends the southernmost limit of the known distribution of the genus. A revised key to the species of Eotrechus is also provided.
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