Review of the filter-feeding caddisfly subfamily Macronematinae (Trichoptera: Hydropsychidae) in tropical Southeast Asia Author Uy, Christine Jewel C. Author Malicky, Hans Author Bae, Yeon Jae text Raffles Bulletin of Zoology 2018 2018-11-15 66 664 703 journal article 10.5281/zenodo.5360916 2345-7600 5360916 5AC21789-E1C1-4B48-813D-667D7638893C Macrostemum trifasciatum Banks, 1934 ( Figs. 165–169 ) Macrostemum trifasciatum Banks, 1934: 575 [ Holotype male; Malaysia ; SMKM]. Figs. 165–176. Macrostemum trifasciatum . 165, right forewing; Male genitalia: 166, lateral; 167, segment X dorsal; 168, phallus lateral; 169, phallus tip. Macrostemum zenon . 170, right forewing. Macrostemum sp. 171, right forewing; 172, right hind wing; Male genitalia: 173, lateral; 174, segment X dorsal; 175, phallus lateral; 176, phallus tip. Scale: 165, 170–172 = 2 mm; 166–169, 173–176 = 0.02 mm (170 redrawn from Malicky, O’Connor & Ashe, 2010 ). Diagnosis. Male. Antennae 33 mm in length. Antennal flagellum brown with darker striations. Forewing 15 mm and hindwing 10 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4. Male genitalia. Inferior appendages two-segmented, harpago long and narrow ( Fig. 166 ). In lateral view, phallus apex flat without any protrusion ( Fig. 168 ), in dorsal view subrectangular ( Fig. 169 ). Segment IX in dorsal view subrectangular, without dorsal keel in posterior margin ( Fig. 167 ). Segment X in lateral view subtriangular with subbasal wart ( Fig. 166 ). Female. Antennae 25 mm in length. Antennal flagellum brown with darker striations. Forewing 10 mm and hindwing 5 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4. Material examined. Malaysia : 9 males , 9 females , Sabah , Kinabalu National Park , coll. I. Sivec , 22 April 1999 (HMPC) . Distribution. Borneo. Remarks. Original description by Banks (1934) did not include illustrations. Malicky (1998b) redescribed this species. This species can be easily distinguished from other congeners by the distinct wing pattern as shown in Fig. 165 .