Polymorphanisus nigricornis Walker, 1852

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 : 690-691

Polymorphanisus nigricornis Walker, 1852

( Figs. 187 , 196 , 211–213, 229)

Polymorphanisus nigricornis Walker, 1852: 79 [Holotype male; India; NHMUK]; Betten & Mosely, 1940: 212–214, Figs. 106a–106d (redescription).

Diagnosis. Male. Antennae 40 mm in length. Antennal flagellum light brown with darker striations. Forewing 20 mm and hind wing 15 mm in length. Mesoscutum without evident markings. Mesoscutellum with paired dark brown spots located on each side ( Fig 187 ). Tibial spurs 1.3.3.

Male genitalia. Inferior appendages two-segmented, harpago short and blunt. In lateral view, phallus with broad and somewhat flat apex (Fig. 212). In dorsal view, segment IX curved and segment X divided medially with two lobes each side ( Fig. 229 ).

Female. Antennae 50 mm in length. Antennal flagellum basal half darker brown and getting lighter throughout apical half. Forewing 25 mm and hind wing 12 mm in length. Mesoscutum without evident markings. Mesoscutellum same as male ( Fig 187 ). Tibial spurs 1.3.3.

Material examined. Vietnam: 12 females, Nam Cat Tien, coll. H. Malicky, 17–25 June 1995 (HMPC) ; Laos: 1 male, Vientiane Province, Lao Pako, coll. J. Bezdek, 1–4 May 2004 (HMPC) .

RAFFLES BULLETIN OF ZOOLOGY 2018

Distribution. India, Laos, Thailand, Vietnam, Sumatra, Java.

Remarks. Barnard (1980) provided a clear redescription and remarks of this species. However, we examined individuals with different tibial spur formula of 2.3.3. Other diagnostic characters are illustrated in Figs. 187 , 196 , 211–213, and 229.

Figures

Figs. 183–192. Polymorphanisus thorax. 183, astictus, ocularis male and female thorax; 16, fuscus male thorax; 184–185, fuscus female thorax; 186, muluensis male and female thorax; 187, nigricornis male and female thorax; 188, quadripunctatus male and female thorax; 189, semperi male and female thorax; 190, scutellatus male thorax; 191, scutellatus female thorax; 192, unipunctus male and female thorax. Scale = 2 mm (189 redrawn from Barnard, 1980).

Figs. 193–201. Polymorphanisus male right fore- and hind wings. 193, astictus; 194, fuscus; 195, muluensis; 196, nigricornis; 197, ocularis; 198, quadripunctatus; 199, semperi; 200, scutellatus; 201, unipunctus. Scale = 5 mm (199 redrawn from Barnard, 1980).

Figs. 95–111. Macrostemum fenestratum. 95–101, right forewing variants; Male genitalia: 102, lateral; 103–104, segment X variants dorsal; 105, phallus lateral; 106, phallus tip. Macrostemum floridum. 107, right forewing; Male genitalia: 108, lateral; 109, segment X dorsal; 110, phallus lateral; 111, phallus tip. Scale: 95–101, 107 = 2 mm; 102–106, 108–111 = 0.02 mm.

Figs. 226–234. Polymorphanisus segment X of male genitalia. 226, astictus; 227, fuscus; 228, muluensis; 229, nigricornis; 230, ocularis; 231, quadripunctatus; 232, semperi; 233, scutellatus; 234, unipunctus. Scale = 0.5 mm (232 redrawn from Barnard, 1980).