Polymorphanisus fuscus 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 : 690

Polymorphanisus fuscus Ulmer, 1905

( Figs. 184–185 , 194 , 205–207, 227)

Oestropsis fusca Ulmer, 1905b: 42 [Holotype female; Sumatra; MZPW ( Tomaszewski, 1961: 4)].

Diagnosis. Male. Antennae 30 mm in length. Antennal flagellum brown with darker striations. Forewing 20 mm and hind wing 15 mm in length. Mesoscutum without evident markings. Mesoscutellum with dark brown spot covering anterior third ( Fig. 184 ). Tibial spurs 1.3.3.

Male genitalia. Inferior appendages two-segmented. In dorsal view, phallus produced into two apical lobes (Fig. 207). In lateral view, segment X with blunt triangular projection pointing caudad (Fig. 206).

Female. Antennae and wing lengths same as for male. Mesoscutum with two squarish dark brown markings occupying almost half of total area. Mesoscutellum with large oval dark brown spot covering nearly whole area ( Fig. 185 ). Tibial spurs 1.3.3.

Material examined. Indonesia: 2 males, 3 females, Sumatra, Aek Tarum, coll. E.W. Diehl, 6 January 1978 (HMPC) ; 3 males, 2 females, Sumatra, Aek Tarum, coll. E.W. Diehl, 7 August 1994 (HMPC) .

Distribution. Sumatra, Borneo, Malaysia (Johor).

Remarks. Barnard (1980) provided a detailed redescription of this species. However, we examined individuals with different tibial spur formula of 2.3.3. Other diagnostic characters are illustrated in Figs. 184, 185 , 194 , 205–207, and 227.

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).