Revision of the genus Eotrechus Kirkaldy (Hemiptera, Heteroptera, Gerridae), with descriptions of six new species Author Tran, Anh Duc https://orcid.org/0000-0001-9605-0739 Faculty of Biology, University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam tran.anhduc@hus.edu.vn Author Zettel, Herbert https://orcid.org/0000-0002-7760-0472 Herbert Zettel, 2 nd Zoological Department (Entomology), Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria Author Sites, Robert W. https://orcid.org/0000-0002-3895-813X Enns Entomology Museum, University of Missouri, Columbia, MO 65211, USA text Deutsche Entomologische Zeitschrift 2023 2023-03-16 70 1 69 111 http://dx.doi.org/10.3897/dez.70.97117 journal article http://dx.doi.org/10.3897/dez.70.97117 1860-1324-1-69 99BBA4C8ED2048879952B61CC25309D4 CA0CBE818BFA5DFA80DBD42521D5DBE3 Eotrechus kalidasa Kirkaldy, 1902 Figs 4A-C , 5F , 25 Eotrechus kalidasa Kirkaldy, 1902: 137 (type locality: Carin Cheba, Myanmar). Eotrechus kalidasa : Distant (1903 : 182, fig. 130) (redescription); Paiva (1919 : 364) (record "Garo Hills, Assam" [Meghalaya]); Andersen (1982 : 8-11, figs 8, 15, 28) (descriptive notes); Tran and Zettel (2006 : 46-48, figs 17-20) (descriptive notes). Material examined. Paratype : Myanmar • 1 ♀ (macropterous); "Carin Cheba, 900-1100m , L. Fea , 1889 / Distant Coll. 1911-383"; BMNH . Other material. India • 1 ♂ (macropterous); Meghalaya , 3 km E Tura ; 25°30'N , 94°14'E ; 1150 m a.s.l. ; 18 Apr. 1999 ; L. Dembicky & P. Pacholatko leg.; NHMW . Diagnosis. Size: macropterous male, length 9.50, width 2.06; macropterous female, length 10.80, width 2.30. Antennal segments subequal in length, segments I and IV slightly longer than segments II and III; segment III shortest. Mesosternum ca. 1.5 x length of metasternum (1.72: 1.13). Fore femur slender in both sexes. Male: abdominal sterna III-VII with longitudinal median groove; sternum VII ca. 0.75 x length of two preceding sterna combined, posterior margin slightly emarginated. Male genitalia: pygophore with two long, relatively slender posterolateral projections (Fig. 4A ); paramere long and slender, sinuate in dorsal view, proximal part strongly curved (convex dorsad) in lateral view, distal part straight, apex rounded (Figs 4C , 5F ); proctiger slightly expanded posterolaterally, posterior margin rounded (Fig. 4B ). Female: abdomen long and slender, genitalia concealed in the abdomen in lateral view. Remarks. The record of Eotrechus kalidasa from India has been discussed and confirmed by Tran and Zettel (2006 : 47-48), and comparative notes have been presented in detail by Andersen (1982 : 10-11). Distribution. Myanmar ( Kirkaldy 1902 ), India: Meghalaya ( Paiva 1919 ) (Fig. 25 ). Note that the male specimen from Thailand reported as E. kalidasa by Vitheepradit and Sites (2007) and Nakthong et al. (2014) actually belongs to a new species, E. steineri sp. nov. (see below).