Macrostemum dione Malicky & Chantaramongkol, 1998

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 : 674

Macrostemum dione Malicky & Chantaramongkol, 1998

( Figs. 70–74 )

Macrostemum dione Malicky & Chantaramongkol, 1998 (in Malicky, 1998b): 776 [Holotype male; Sumatra; HMPC].

Diagnosis. Male. Antennae 23 mm in length. Antennal flagellum first few segments darker brown then lighter throughout with darker striations. Forewing 10 mm and hind wing 5 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented ( Fig. 71 ). In lateral view, phallus with spine-like structure at anterior portion of apex ( Fig. 73 ). In dorsal view, phallus with lobular tongue at apex, and spine-like structure appears broader in dorsal view ( Fig. 74 ). In lateral view, segment X elongated narrowing toward apex ( Fig. 71 ).

Female. Antennae 20 mm in length. Antennal flagellum same colouration as male. Forewing 10 mm and hind wing 7 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Type material examined. Paratypes. Vietnam: 2 males, 2 females, Nam Cat Tien, coll. H. Malicky, 17–25 June 1995 (UM: UMSP000208571 ) .

Distribution. Laos, Malaysia (Perak, Pahang), Sumatra, Thailand, Vietnam.

Remarks. We provide a photograph of the actual wing of the species ( Fig. 70 ).

Figures

Figs. 70–84. Macrostemum dione. 70, right forewing; Male genitalia: 71, lateral; 72, segment X dorsal; 73, phallus lateral; 74, phallus tip. Macrostemum distinguendum. 75, right fore- and hind wing; Male genitalia: 76, lateral; 77, segment X dorsal; 78, phallus lateral; 79, phallus tip. Macrostemum dohrni. 80, right forewing; Male genitalia: 81, lateral; 82, segment X dorsal; 83, phallus lateral; 84, phallus tip. Scale: 70, 75, 80 = 2 mm; 71–74, 76–79, 81–84 = 0.02 mm.