Macrostemum pallipes Banks, 1931

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 : 681-683

Macrostemum pallipes Banks, 1931

( Figs. 137–141 )

Macrostemum pallipes Banks, 1931a: 422 [Holotype male, Malaysia; MCZ].

Diagnosis. Male. Antennae 35 mm in length. Antennal flagellum brown with darker striations. Forewing 13 mm and hindwing 7 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

RAFFLES BULLETIN OF ZOOLOGY 2018

Male genitalia. Inferior appendages two-segmented, very slender especially harpago ( Fig. 138 ). In lateral view, phallus with squarish apex ( Fig. 140 ), with protrusion in ventral view ( Fig. 141 ). In dorsal view, segment X divided medially with shorter lobes as compared to other Macrostemum species ( Fig. 139 ).

Female. Antennae broken. Antennal flagellum same as males. Forewing 11 mm and hindwing 6 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Material examined. Malaysia: 3 males, 2 females, Sabah, Kinabalu National Park , Poring hot spring, coll. I. Sivec, 22 April 1999 (HMPC) .

Distribution. Borneo.

Remarks. Original description by Banks (1911) did not include illustrations. Unlike most Macrostemum species , no wing markings were observed ( Fig. 137 ).

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.