Macrostemum albardanum Banks, 1931

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 albardanum Banks, 1931

( Figs. 37–41 )

Macrostemum albardanum Banks, 1931a: 396 [Holotype male; Malaysia; MCZ].

Diagnosis. Male. Antennae 22 mm in length. Antennal flagellum light brown with darker striations. Forewing 10 mm and hind wing 7 mm in length. Forewing pattern very much obvious with dark colour in almost half of wing and light brown colour in another half ( Fig. 37 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 1.4.4.

Male genitalia. Inferior appendages two-segmented. In lateral view, phallus with protrusion at apex. In lateral view, segment X elongated, narrowing toward apex.

Material examined. Thailand: 3 males, Ranong Province, Namtok Ngao, coll. T. Prommi, 8 August 2004 (HMPC) .

Distribution. Malaysia, Thailand, Vietnam.

Remarks. No female specimens were available for examination. The male wing ( Fig. 37 ) and male genitalia ( Figs. 38–41 ) were redrawn.

Figures

Figs. 37–41. Macrostemum albardanum. 37, right forewing; Male genitalia: 38, lateral; 39, segment X dorsal; 40, phallus lateral; 41, phallus tip. Scale: 37 = 2 mm; 38–41 = 0.02 mm.