Journal of Advanced Laboratory Research in Biology E-ISSN: 0976-7614 Volume 9, Issue 2, 2018 PP 68-70 https:/ / e-journal.sospublication.co.in *Corresponding Author: Dr. Kanhiya Mahour 0000-0001-7059-6274. E-mail: kris_mathura@yahoo.com. Phone No.: +91-9412404655. Research Article Description of Copulatory complex of Eotrechus kalidasa Kirkaldy, 1902 (Hemiptera: Heteroptera, Gerridae) Jagvir Singh 1 and V.K. Khandelwal 2 and Kanhiya Mahour * 1 Department of Zoology, B.S.A. College, Mathura-281004 (U.P.), India. 2 Department of Zoology, K.R. (P.G.) College, Mathura-281004 (U.P.), India. * Department of Zoology, R.P.P.G. College, Kamalganj, Farrukhabad-209724 (U.P.), India. Abstract: The genus Eotrechus Kirk, 1903 belonging to subfamily Eotrechinae Anderson, 1975 is represented by a single species Eotrechus kalidasa Kirk, 1902 in India. The description of species by Kirk, 1903, Distant, 1903, Paiva, 1919 and Lundblad, 1933 has not taken into account the structure of copulatory complex, a feature of great taxonomic significant. The present contribution provides the description copulatory complex of Eotrechus kalidasa for the first time. Keywords: Copulatory complex, Eotrechus, Heteroptera, Gerridae. Taxonomy Eotrechus Kirkaldy, 1902 Eotrechus kalidasa Kirkaldy, 1902. (Pl. I, Figs. 1-2). Eotrechus kalidasa Kirkaldy, 1902. Entomologist, p. 137. Eotrechus kalidasa Distant, 1903. Faun. Brit. India, Rhynchota, 2(1):182. Eotrechus kalidasa Paiva, 1919. Rec. Indian Mus., 16:364. Eotrechus kalidasa Lundblad, 1933. Arch. Hydrobiol. Suppl. Bd., 12(2):370. Description This genus was erected by Kirkaldy (1902) with Eotrechus kalidasa, Kirkaldy, 1902 as type species. Antenna slender, all segments nearly equal to each other. Clypeus with basal margin clearly defined. Mandibular and maxillary plates distinctly separated from each other. Intersegmental suture between mesonotum and metanotum lost laterally. Prosternum relatively long. Mesosternum only one and a half times as along as metasternum. Sternal and pleural regions of mesothorax clearly defined by paired longitudinal sutures. Metasternum with highly reduced omphalium. Omphalial groove absent. Middle leg shorter than hind leg. The tibia, a little longer than femur, in hind leg. Claws arising apically. Second to seventh ventrites subequal in length. Pygophore with the styloide. Parameres present, slender and apically rounded. Distribution: Burma, India. This genus is represented by single species in India. Eotrechus kalidasa Kirkaldy, 1902 (Pl. I, Figs. 1-2) Male genitalia: Seventh segment, without connexival spine, ventral apical margin simply concave. Eighth ventrite shorter than seven ventrite, apical margin concave, eighth tergite broadly convex on hind margin. Ninth segment simple, narrow surnal plate; pygophore with a pair of distinct styloides, one on either side; parameres apically rounded, slender. Endosoma with definitive dorsal plate basally bifurcate, apically extending onto apical margin of endosoma, not connected with large apical plate; lateral plates simple and long; without basal plate; ventral plate short and membranous. Female genitalia: Seventh segment well developed both dorsally and ventrally. Connexivum without connexival spine. Eighth segment with first valvula with inner lobe simple, narrow, extending a little less than halfway of outer lobe; outer lobe narrow, blunt apically. Ninth segment with second valvula broadly