Thysanarthria saurahana sp. nov. (Figs 9 A–E, 11) Type material. HOLOTYPE: ♂ (SMNS): NEPAL: ʻNepal, Narayani, Sauraha, Rapti River bank, light trap, 180, 84.49695, 27.56667, 2000- 04-18, A. Weigel, NEPAL, Prov. Narayani / Sauraha, Rapti River / Ufer, 180mNN, 27°34´80´´N, 84°29´49´´E / LF, 18.IV.2000 / leg. Weigel // Thysanarthria / madurensis / det. F. Hebauer’. Description. Body length 1.7 mm, maximum body width 1.0 mm. Head and labrum black; uniformly yellowish; elytra uniformly yellowish; legs yellowish. Head with strong mesh-like microsculpture on interstices; punctation sparse, each puncture bearing pointed seta. Eyes separated by 2.7× the width of one eye in dorsal view. Pronotum with sparse setiferous punctation similar to that on head; interstices with strong mesh-like microsculpture. Elytra with 10 striae sharply impressed except anteromedially (widely around scutellar shield) where neither striae nor serial punctures are visible; intervals weakly convex at midlength and near apex; interval punctation sparse, setiferous; interstices without microsculpture. Aedeagus (Figs 9 A–E) 0.5 mm long. Phallobase slightly widened at base of parameres, c. as wide as parameres combined, slightly narrowed towards basal fifth and abruptly widened at base; arcuate in lateral view. Paramere narrowly elongate, subequal in width throughout, apex abruptly narrowing into a short mesoapical ʻtooth’. Median lobe much shorter than parameres, with strongly sclerotized shorter part arcuate apically, and membranous apical part rounded apically; gonopore large, triangular, situated subapically. Differential diagnosis. Thysanarthria saurahana is the only species in Himalaya with strong mesh-like microsculpture on the pronotum (in contrast to pronotum without microsculpture in T. championi and T. siamensis, and with weak granulate microsculpture in T. madurensis). It can be distinguished from all these species as well as from all other Thysanarthria by the shape of parameres and the unique morphology of the median lobe which is not similar to any other species of the genus. Etymology. The species name refers to the village of Sauraha at the border of the Chitwan National Park in Nepal where the holotype was collected. Adjective. Biology. Unknown. Distribution. Only known from the type locality.

Published as part of Fikáček, Martin & Liu, Hsing-Che, 2019, A review of Thysanarthria with description of seven new species and comments on its relationship to Chaetarthria (Hydrophilidae: Chaetarthriini), pp. 229-252 in Acta Entomologica Musei Nationalis Pragae 59 (1) on pages 246-247, DOI: 10.2478/aemnp-2019-0020, http://zenodo.org/record/4488918