Macrostemum midas 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 : 681

Macrostemum midas Malicky & Chantaramongkol, 1998

( Figs. 126–130 )

Macrostemum midas Malicky & Chantaramongkol (in Malicky, 1998b): 770 [Holotype male; Thailand; HMPC].

Diagnosis. Male. Antennae 30 mm in length. Antennal flagellum darker brown in first few segments and brown throughout. Forewing 12 mm and hind wing 8 mm in length with dark brown stripe along middle of forewing curving anteriorly ( Fig. 126 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented ( Fig. 127 ). In lateral view, phallus with flat apex ( Fig. 129 ), with protrusion at ventral view ( Fig. 129 ). In dorsal view, segment IX apex concave with long setae ( Fig. 128 ). Segment X divided medially, with each lobe blunt, with subapical wart with cluster of small setae ( Fig. 128 ).

Female. Antennae 30 mm in length. Antennal flagellum same as males. Forewing 9 mm and hind wing 7 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Type material examined. Holotype. Thailand: male, Ranong Province, Klong Nakha Wildlife Sanctuary, coll. Schwendinger, 29 January 1991 (HMPC).

Paratypes. Thailand: 2 males, Ban Tramot, Southern Thailand, coll. H. Malicky, 29 April 2003 (HMPC) .

Additional material examined. Thailand: 3 males, 13 females, Khao Kitchakut, coll. H. Malicky, 24 April 1996 (HMPC) ; 24 females, Putoei, Ban Huai Hindam, coll. H. Malicky, 26 April 2001 (HMPC).

Distribution. Cambodia, Laos, Malaysia (Perak, Pahang, Johor), Thailand, Vietnam.

Remarks. Examined specimens of M. midas possess a dark brown stripe in the middle of each forewing, as in M. fastosum . However, in M. midas , the stripes arch anteriorly ( Fig. 126 ), whereas, in M. fastosum , the stripe is straight. The hind wing venation of M. midas is the same as that of M. fastosum ( Fig. 90 ).

Figures

Figs. 126–141. Macrostemum midas. 126, right forewing; Male genitalia: 127, lateral; 128, segment X dorsal; 129, phallus lateral; 130, phallus tip. Macrostemum opulentum. 131–132, right forewing; Male genitalia: 133, lateral; 134, segment X dorsal; 135, phallus lateral; 136, phallus tip. Macrostemum pallipes. 137, right forewing; Male genitalia: 138, lateral; 139, segment X dorsal; 140, phallus lateral; 141, phallus tip. Scale: 126, 131–132, 137 = 2 mm; 127–130, 133–136, 138–141 = 0.02 mm.

Figs. 85–94. Macrostemum eleanora. 85, right forewing; Male genitalia: 86, lateral; 87, segment X dorsal; 88, phallus lateral; 89, phallus tip. Macrostemum fastosum. 90, right fore- and hind wing; Male genitalia: 91, lateral; 92, segment X dorsal; 93, phallus lateral; 94, phallus tip. Scale: 85, 90 = 2 mm; 86–89, 91–94 = 0.02 mm.