Macrostemum hestia 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 : 679

Macrostemum hestia Malicky & Chantaramongkol, 1998

( Figs. 112–118 )

Macrostemum hestia Malicky & Chantaramongkol (in Malicky, 1998b): 774 [Holotype male; Thailand; HMPC].

Diagnosis. Male. Antennae broken. Antennal flagellum first few segments darker brown and lighter throughout the segments. Head with dark brown stripe running traverse the head. Forewing 14 mm and hindwing length 7 mm. Forewing pattern as shown ( Fig. 112 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented. In lateral view, phallus with opening in posterior part of the apex ( Fig. 117 ). In ventral view, phallus apex somewhat heart-shaped ( Fig. 118 ). In lateral view, segment X with large wart on apex ( Figs. 113, 115 ). In dorsal view, segment X with longer apex on each side directing sideways ( Figs. 114, 116 ).

Female. Antennae broken. Antennal flagellum and head markings same as male. Forewing 12 mm and hindwing length 8 mm. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Type material examined. Paratypes. Thailand: 7 males, 1 female, Doi Inthanon, Siriphum waterfall, coll. H. Malicky, 20 March 1989 ( UPLBMNH) ; 1 male, Pu Kradung Northern Province , Namtok Penpob, coll. N. Saengpradab, 25 May 1996 (HMPC) ; Malaysia: 1 male, Hulu, Perak, coll. I. Sivec, 3–13 April 1994 .

Distribution. China (Jiangxi), Laos, Malaysia (Perak), Thailand, Vietnam.

Remarks. Genitalia variations were observed among the specimens examined in this study. However, only segment X varied in some specimens ( Figs. 114, 116 ), although the phallus structure was consistent among the examined specimens ( Figs. 117, 118 ).

Figures

Figs. 112–125. Macrostemum hestia. 112, right forewing; Male genitalia: 113, 115, lateral; 114, 116, segment X dorsal; 117, phallus lateral; 118, phallus tip. Macrostemum indistinctum. 119, right forewing; Male genitalia: 120, lateral; 121, segment X dorsal; 122. phallus lateral. Macrostemum luteipes. Male genitalia: 123, lateral; 124, segment X dorsal; 125, phallus lateral. Scale: 112, 119 = 2 mm; 113–118, 120–125 = 0.02 mm (123–125 redrawn from Kimmins, 1955).