Macrostemum dohrni Ulmer, 1905

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 dohrni Ulmer, 1905

( Figs. 80–84 )

Macrostemum dohrni Ulmer, 1905b: 69 [Holotype male, Sumatra; SM]; Malicky, 1998b: 18 (female).

Diagnosis. Male. Antennae 25 mm in length. Antennal flagellum first few segments darker brown then lighter throughout with darker striations. Forewing 15 mm and hindwing 10 mm in length. Forewing pattern as shown ( Fig. 80 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented harpago long and slender ( Fig. 81 ). In lateral view, phallus with small pointed structure in posterior part of apex ( Fig. 83 ) but not evident in dorsal view ( Fig. 84 ). Pointed structure at apex of phallus somewhat similar to M. centrotum but smaller. In dorsal view, segment IX subrectangular ( Fig. 82 ). Segment X divided medially with evident warts near apex ( Fig. 82 ).

Female. Antennae 25 mm in length. Antennal flagellum same colouration as male. Forewing 13 mm and hindwing 10 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Material examined. Thailand: 1 male, 1 female, Kao Soi Dao, coll. N. Waldbach, 23 April 1996 (HMPC) ; Cambodia: 12 males, 5 females, Mondolkiri Province, coll. G. Ronkay & G. Csorba, 30 January 2006 (HMPC) .

Distribution. Cambodia, Malaysia, (Pahang), Sumatra, Thailand.

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.