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 longipes Andersen, 1982 Figs 20A , 21 , 26 Eotrechus longipes Andersen, 1982: 11-13, figs 3, 6, 9, 14, 16, 22, 29, 30 (type locality: Jukdah-Ghoom, India). Eotrechus longipes : Andersen (1998 : 5) (checklist); Thirumalai (2002 : 59) (distribution); Basu et al. (2017 : 397) (record Sikkim, India). Material examined. Holotype : India • ♂ (macropterous); "Jundah-Ghoom, 14-VI-19"; BMNH. Other material. Nepal • 1 ♂ (apterous); Seti D: Bajhang #21, way Ghatganga Khola SW Shima ( 29°43'16"N , 81°20'44"E ) to NE Shima ( 29°44'51"N , 81°23'04"E ); 2000- 2300 m a.s.l. ; 19 Jun. 2009 ; J. Kuessner leg.; NME . Diagnosis. Size: apterous males, length 7.6-8.2, width 2.4-2.6; macropterous males, length 8.9-10.0 (holotype 10.0), width 2.30-2.71 (holotype 2.71); apterous female, length 8.3, width 2.6; macropterous females, length 8.9-10.2, width 2.6-2.9 (from Andersen 1982 ). Mesosternum ca. 3.0 x length of metasternum. Male: fore femur moderately incrassate, fore trochanter with small tubercle bearing black, minute setae (Fig. 21A ); abdominal sterna V-VII medially grooved, more widened on sternum VII; length of sternum VII subequal to two preceding sterna combined, posterior margin slightly emarginated. Male genitalia: venter of segment VIII broadly, medially depressed; pygophore with two broad posterolateral projections, lower margin of projection with a notch (in lateral view); proctiger slender, with pointed apex (Fig. 21B ). Female: abdomen about a half of body length; sternum VII ca. 1.5 x length of two preceding sterna combined; genitalia visible in lateral view. Figure 20. Habitus of Eotrechus species. A. E. longipes , apterous male from Nepal; B. E. anderseni sp. nov., macropterous female. Figure 21. Eotrechus longipes , holotype. A. Right fore leg; B. Abdominal apex, ventral view. Remarks. See Remarks under E. anderseni sp. nov. for comparative notes on three species of the E. longipes group. Distribution. India: W. Bengal, Uttar Pradesh, Arunachal Pradesh, Sikkim; Nepal ( Andersen 1982 ; Thirumalai 2002 ; Basu et al. 2017 ) (Fig. 26 ).