Endemic and sub-endemic water beetles of Mongolia and their distribution ranges Author Enkhnasan, Davaadorj Institute of Biology, Mongolian Academy of Sciences, Peace Avenue 54 b, Ulaanbaatar 13330, Mongolia enkhnasand@mas.ac.mn Author Boldgiv, Bazartseren Ecology Group, Department of Biology, National University of Mongolia, Ikh Surguuliin Gudamj 1, & Academy of Natural Sciences of Drexel University, Philadelphia, PA 19103, USA text Journal of Species Research 2019 8 4 395 406 journal article 10.12651/JSR.2019.8.4.395 2713-8615 13161488 Ochthebius mongolensis Janssens, 1967 ( Fig. 3 ) Diagnosis . Body length: 1.60 - 1.65 mm . Anterior bor- der of the right labrum not indented; its extremities only curved in such a way that the edge is not convex in all its width. Punctuation of the clypeus is sparse. Uncomplicat- ed intercooler space: the points separated by smooth intervals, except in the two foveoles, which are crumbled. The outer edge of pronotum is a very obtuse angle, their posterior notch barely visible. Disc occupied by a transverse double depression whose anterior part is more or less smooth and the posterior distressed like the auricles. Streaks of elytra, punctuated well, but coarse. Both sexes have a matte pitch black, without bronze reflection even on the head and the pronotum. Funicular antennae have a more yellowish hue. The male genital frame has a mobile lobe shaped cornet surrounded by a veil more held ( Janssens, 1967 ). Published records . Bellstedt, 1985:139 - Khovd . Remarks . Ochthebius mongolensis Janssens, 1967:56 - [ Holotype ♂ (Hungarian National Museum, Budapest): Mongolia , Töv , 1,340 m , 19.vii.1965 , leg. Z. Kaszab]. Khentii , 900 m . 19.viii.1965 . 1$; Type specimens are at the Hungarian National Museum and Museum of Natural History of the Humboldt University, Berlin.