Dilar truncatus Li & Aspöck & Aspöck & Liu 2020, sp. nov.

Dilar truncatus sp. nov.

(Figs 7, 31–34)

Diagnosis. The new species is characterized by the forewing with pale brown markings arranged as several inconspicuous stripes, the male genital sclerites with gonocoxite 9 distally truncate and subdistally with short medially directed projection, and the gonocoxite 10 distally with incurved and falcate apex.

Description. Male. Body length 4.0 mm; forewing length 6.4 mm, hind wing length 5.6 mm.

Head generally brown, with pale yellowish brown setose tubercles. Vertex dark brown. Frons with a blackish brown transverse stripe marking between antennae sockets. Compound eyes blackish brown. Antenna brown, flagellum pectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 3.5 times as long as corresponding flagellomere, distal seven flagellomeres simple.

Pro-, meso- and metathorax yellowish brown, pronotum yellow; mesonotum brown, darker on posterior, metanotum yellow. Legs pale brown, femora and tibiae dark brown at their tips. Wings hyaline, slightly smoky brown. Forewing 2.0 times as long as wide, with brown spots, arranged as several inconspicuous transverse arcuate stripes; longitudinal veins pale yellow, interrupted by numerous brown spots; crossveins pale yellow. Hindwing 2.0 times as long as wide, almost immaculate.

Abdomen yellow. Tergum 9 (Fig. 31) in dorsal view with an arcuate anterior incision, a nearly U-shaped posterior incision, leaving a pair of broad hemitergites, which are obtuse distally and densely haired. Sternum 9 (Fig. 32) subtrapezoidal, membranous, only half of the length of tergum 9. Ectoproct subtriangular (Figs 31–32), in dorsal view with an arcuate anterior incision, posteroventrally with a pair of nearly semicircular and flattened projections (Fig. 32); posterodorsally with a pair of unguiform projections (Fig. 31). Gonocoxite 9 (Fig. 31) inflated, posteriorly truncate, subdistally with digitiform projection on inner margin which is directed medially. Gonocoxite 10 (Fig. 32) almost as long as gonocoxite 9, incurved and falcate, slightly swollen on proximal half, slenderly elongate on distal half. Fused gonocoxites 11 (Fig. 31) nearly W-shaped, laterally connecting to proximal half of gonocoxites 9 and 10. Hypandrium internum absent.

Female. Unknown.

Materials examined. Holotype ♂, Ceylon, Anu [radhapura] Dist [rict]. Wildlife Soc. Bungalow Hunuwilagama, Wilpattu, 200 ft [61 m], 10–19.III.1970, Davis & Rowe (PCWH).

Distribution. Sri Lanka (North Central).

Etymology. The specific epithet “ truncatus ” refers to the shape of male gonocoxite 9, which is posteriorly truncate.

Remarks. For differentiation, see Remarks under Dilar austroindicus sp. nov.