Macrostemum dairiana Malicky, 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 : 673-674

Macrostemum dairiana Malicky, 1998

( Figs. 65–69 )

Macrostemum dairiana Malicky, 1998b: 775 [Holotype male; Indonesia; HMPC].

Diagnosis. Male. Antennae 23 mm in length. Antennal flagellum brown with darker striations. Forewing 12 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. 66 ). In lateral view, phallus apex divided into two lobes making it with U-shape opening at center ( Fig. 68 ). In lateral view, segment X broad and width toward apex not as narrow as other species such as M. dione and M. fenestratum ( Fig. 66 ). In dorsal view, segment X long and divided medially wherein apex of each side lobular ( Fig. 67 ).

Type material examined. Holotype. Indonesia: male, North Sumatra, Dairi, coll. E.W. Diehl, 20 September 1970 (HMPC).

Paratypes. Indonesia: 2 males, North Sumatra, Dairi, coll. E.W. Diehl, 20 September 1970 (HMPC) .

Distribution. Sumatra.

Remarks. No female specimens were available for examination.

Figures

Figs. 59–69. Macrostemum caliptera. 59, right forewing. Macrostemum centrotum. 60, right forewing; Male genitalia: 61, lateral; 62, segment X dorsal; 63, phallus lateral; 64, phallus tip. Macrostemum dairiana. 65, right forewing; Male genitalia: 66, lateral; 67, segment X dorsal; 68, phallus lateral; 69, phallus tip. Scale: 59, 60, 65 = 2 mm; 61–64, 66–69 = 0.02 mm (59 redrawn from Banks, 1931c).