Macrostemum bacham Hoang, Tanida & Bae, 2005

Uy, Christine Jewel C., Malicky, Hans & Bae, Yeon Jae, 2018, Review of the filter-feeding caddisfly subfamily Macronematinae (Trichoptera: Hydropsychidae) in tropical Southeast Asia, Raffles Bulletin of Zoology 66, pp. 664-703 : 670

Macrostemum bacham Hoang, Tanida & Bae, 2005

( Figs. 42–46 )

Macrostemum bacham Hoang et al., 2005: 163 [Holotype male; Vietnam; KU].

Diagnosis. Male. Antennae 40 mm in length. Antennal flagellum dark brown in first few segments then lighter throughout with darker striations. Forewing 17 mm and hind wing 13 mm in length. Forewing with three dark brown spots ( Fig. 42 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented, harpago long and slender. In lateral view, phallus with protrusion at apex ( Fig. 45 ) and in dorsal view, protrusion tongue-shaped ( Fig. 46 ).

Female. Antennae broken. Antennal flagellum same as male. Forewing 11 mm and hind wing 9 mm in length. Forewing pattern same as male ( Fig. 42 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Material examined. Laos: 1 male, 2 females, Champasak Province, Bolavens Plateau, coll. J. Hajek, 9 May 2010 (HMPC) ; 1 male, Kham Mouan Province, Ban Khoun Ngeun, coll. P. Pacholatko, 24–29 April 2001 (HMPC) ; Vietnam: 1 male, 1 female, Dak Lak, Dak Pri, coll. D.H. Hoang, 11 April 2003 (KU) .

Distribution. Laos, Vietnam.

Remarks. The male wing ( Fig. 42 ) was photographed and male genitalia ( Figs. 43–46 ) were redrawn from Malicky (2010).

Figures

Figs. 42–58. Macrostemum bacham. 42, right forewing; Male genitalia: 43, lateral; 44, segment X dorsal; 45, phallus lateral; 46, phallus tip. Macrostemum bellerophon. 47, right forewing; Male genitalia: 48, lateral; 49, segment X dorsal; 50, phallus lateral; 51, phallus tip. Macrostemum bellum. 52, right forewing. Macrostemum bifenestratum. 53, right forewing. Macrostemum boettcheri. 54, right forewing; Male genitalia: 55, lateral; 56, segment X dorsal; 57, phallus lateral; 58, phallus tip. Scale: 42, 47, 52–53 = 2 mm; 43–46, 48–51, 55–58 = 0.02 mm (43–46 redrawn from Malicky, 2010; 52 redrawn from Banks, 1916; 56 redrawn from Navás, 1929).