Macrostemum boettcheri Ulmer, 1930

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 : 672

Macrostemum boettcheri Ulmer, 1930

( Figs. 54–58 )

Macrostemum boettcheri Ulmer, 1930: 389 [Holotype male; Philippines; ZMHB]; Malicky, 1998b: 777 (redescription).

Diagnosis. Male. Antennae 18 mm in length. Antennal flagellum same colouration as male. Forewing 9 mm and hind wing 6 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented, harpago almost same length as coxopodite ( Fig. 55 ). In dorsal view, phallus with oval apex ( Fig. 58 ). In lateral view, phallus with more elongated anterior part of apex ( Fig. 57 ). Segment X divided medially with elongated lobes longer than other Macrostemum species , with elongated blunt apex in lateral view ( Fig. 55 ).

Female. Antennae 18 mm in length. Antennal flagellum same colouration as male. Forewing 9 mm and hind wing 6 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Material examined. Philippines: 2 males, Romblon Province, Sibuyan, Lambingan falls , coll. H. Zettel, 21 November 1994 ( UPLBMNH) ; 3 males, 2 females, Los Banos, Laguna, Province, Molawin creek , coll. C.J. Uy, 18 April 2014 ( UPLBMNH) .

Distribution. Philippines (Luzon).

Remarks. Male of this species can be distinguished from other congeners by the wing colour pattern as shown in Fig. 54 . Forewings possess orange markings at the middle part in fresh specimens.

Figures

Figs. 42–58. Macrostemum bacham. 42, right forewing; Male genitalia: 43, lateral; 44, segment X dorsal; 45, phallus lateral; 46, phallus tip. Macrostemum bellerophon. 47, right forewing; Male genitalia: 48, lateral; 49, segment X dorsal; 50, phallus lateral; 51, phallus tip. Macrostemum bellum. 52, right forewing. Macrostemum bifenestratum. 53, right forewing. Macrostemum boettcheri. 54, right forewing; Male genitalia: 55, lateral; 56, segment X dorsal; 57, phallus lateral; 58, phallus tip. Scale: 42, 47, 52–53 = 2 mm; 43–46, 48–51, 55–58 = 0.02 mm (43–46 redrawn from Malicky, 2010; 52 redrawn from Banks, 1916; 56 redrawn from Navás, 1929).