Dilar qiongduensis, Li & Liu, 2025

Dilar qiongduensis sp. nov.

Fig. 6 Common name. 邛都栉角蛉 View Figure 6

Diagnosis.

The new species is characterised by the forewing with many short, arcuate stripes throughout (Fig. 6 A View Figure 6 ), by male gonocoxite 9 notably inflated, with rectangular proximal half (Fig. 6 B, F View Figure 6 ), by the blade-like male gonocoxite 10 submedially with a sclerite connecting to gonocoxite 9 (Fig. 6 G View Figure 6 ) and by the W-shaped male fused gonocoxites 11 (Fig. 6 C, F View Figure 6 ).

Description.

Male. Body length 8.4 mm; forewing length 10.2 mm, hindwing length 9.2 mm.

Head generally brown, with pale yellow setose tubercles; vertex brown. Compound eyes blackish-brown. Antenna brown, scapus and pedicellus dark brown; flagellum pectinate, medial branches longer than those branches at base, longest branch nearly 5.2 times as long as corresponding flagellomere, distal seven flagellomeres simple.

Thorax brown; pronotum paler, with a pair of yellow ovoid tubercles at middle; mesonotum dark brown at middle, as well as along anterior, posterior and lateral margins, submedially with a pair of brown oblique markings; metanotum paler than mesonotum. Legs pale brown, tibiae and each tarsomere dark brown at tip. Wings slightly pale brown (Fig. 6 A View Figure 6 ). Forewing 2.4 times as long as wide, with many transversely arcuate stripes, markings darker on the proximal 1 / 3 and costal space; two nygmata respectively present at base and middle, median nygma surrounded by a small brownish spot; longitudinal veins pale yellow, interrupted by many brown spots; crossveins pale brown. Hindwing 2.3 times as long as wide, almost immaculate.

Abdomen brown, with each pregenital segment dark brown dorsally. Tergum 9 in dorsal view with an arcuate incision, a nearly V-shaped posterior incision, leaving a pair of hemitergites, which are obtuse distally and densely setose. Sternum 9 subtrapezoidal, almost half as long as tergum 9, truncate posteriad (Fig. 6 C, G View Figure 6 ). Ectoproct in dorsal view nearly rectangular, with an anterior incision; posterodorsally with a pair of unguiform projections (Fig. 6 F, I View Figure 6 ), posteroventrally with a digitiform projection and a pair of bifid unguiform projections (Fig. 6 I View Figure 6 ). Gonocoxite 9 inflated at proximal half, nearly rectangular, distal half tapering and curved posterolaterally (Fig. 6 B, F View Figure 6 ). Gonocoxite 10 almost as long as gonocoxite 9, blade-like, with straight and obtuse base, submedially with a sclerite connecting to gonocoxite 9 (Fig. 6 C, G View Figure 6 ). Fused gonocoxites 11 nearly W-shaped, laterally connecting to bases of gonocoxites 9 (Fig. 6 C, F View Figure 6 ). Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate (Fig. 6 C, G View Figure 6 ).

Materials examined.

Holotype ♂, China • Sichuan Province, Xichang, Dajinglinchang [西昌市大箐林场], 16. V. 2020, Tao Li ( CAU) . Paratypes • 34 ♂, same data as holotype ( CAU) .

Etymology.

The specific epithet “ qiongduensis ” is derived from “ Qiongdu [邛都], ” the ancient name for the south-eastern region of present-day Xichang City, Sichuan, China, where the type specimen was collected. Historically, Qiongdu was an important administrative and cultural centre as early as the Western Han Dynasty, when it served as the capital of Qiongdu County. Situated along the ancient trade routes of southwestern China, it played a key role in the development of the region, particularly as part of the Southern Silk Road. The name Qiongdu reflects the area’s historical significance as a hub of cultural exchange, economic activity and strategic importance in the Sichuan Basin. The use of this name honours both the cultural heritage and the natural richness of the region where the species was discovered.

Distribution.

China ( Sichuan).

Remarks.

The new species should be a member of the D. spectabilis species-group, based on the male ectoproct posterodorsally generally with a pair of curved unguiform projections and by the slender elongate male gonocoxite 10 which submedially has a subtriangular lobe connecting to gonocoxite 9, but it can be distinguished from all the other members by the male gonocoxite 9 notably inflated, with rectangular proximal half (Fig. 6 B, F View Figure 6 ), the male gonocoxite 10 with straight base (Fig. 6 C, G View Figure 6 ) and the W-shaped fused male gonocoxites 11 (Fig. 6 C, F View Figure 6 ). In other members of the D. spectabilis species-group, the base half of male gonocoxite 9 is generally subtriangular shape and the fused male gonocoxites 11 are anteriorly convex, not W-shaped ( Zhang et al. 2015).