Dilar abnormis Zhang, Liu & Winterton

Zhang, Wei, Liu, Xingyue, Winterton, Shaun L., Aspöck, Horst & Aspöck, Ulrike, 2016, A review of the pleasing lacewing genus Dilar Rambur (Neuroptera, Dilaridae) from Southeast Asia, Zootaxa 4105 (2), pp. 124-144 : 127-128

Dilar abnormis Zhang, Liu & Winterton , sp. nov.

( Figs. 1 , 11–17 )

Diagnosis. This species is characterized by the broadly inflated male gonocoxites 9 and 10, and by the gonarcus medially with a pair of long, hook-like projections directed anteriorly. The forewing of this species is densely spotted, with spots arranging into several transversely arcuate stripes.

Description. Male. Body length 5.6 mm; forewing length 8.1 mm, hindwing length 6.4 mm.

Head yellowish brown, with pale yellowish brown setose tubercles. Compound eyes blackish brown. Antenna pale yellowish brown, pedicel with brown annular stripes, flagellum unipectinate on most flagellomeres, longest branch nearly 7.0 times as long as relevant flagellomere.

Prothorax brown, pronotum dark brown, medially with a pair of ovoid markings; mesothorax yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with posterior half dark brown; metanotum pale yellowish brown, slightly darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings hyaline, slightly smoky brown, with numerous dark spots. Forewing ~2.0 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygma. Hindwing ~2.2 times as long as wide, much paler than forewing, immaculate. Veins pale yellow, crossveins much darker than longitudinal veins.

Abdomen yellow, pregenital segments dorsally yellowish brown. Tergum 9 in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving a narrow median portion and a pair of subtriangular hemitergites, which are obtuse distally and densely haired. Sternum 9 obviously shorter than tergum 9, arcuately convex posteriad. Ectoproct in dorsal view nearly quadrate, posterodorsally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections, posteroventrally with a pair of short and flattened projections. Gonocoxite 9 broadly inflated, sac-like, with strongly sclerotized, spoon-shaped tip; gonocoxite 10 subtriangular, with strongly sclerotized, spinous tip; gonarcus slender on both ends, laterally coalesced to bases of gonocoxites 9, medial part subtriangular, strongly sclerotized, with a pair of long, hook-like projections, which are directed anteriorly. Hypandrium internum trapezoidal, with lateral margins slightly arcuate.

Female. Body length 5.0 mm; forewing length 7.4 mm, hindwing length 6.1 mm.

Sternum 7 in lateral view nearly trapezoidal, in ventral view subtrapezoidal, with truncate posterior margin. Abdominal segment 8 with sclerotized trapezoidal gonocoxite 8. Bursa copulatrix with colleterial gland tubular, relatively short, with distal half curved upwards; basal part of bursa copulatrix sac-like in lateral view but nearly oval in ventral view. Ectoproct rather small, ovoid.

Materials examined. Holotype ♂, THAILAND: Chiang Mai, Doi Inthanon NP, Checkpoint 2 [18°31.554'N, 98°29.940'E], 1700 m, 8–15.V.2007, Y. Areeluck ( CAU). Paratypes 1♀, same as holotype ( CAU); 1♂, THAILAND: Chiang Mai, Doi Inthanon NP, Checkpoint 2, 1700 m, 15–22.IV.2007, Y. Areeluck ( CSCA).

Distribution. Thailand (Chiang Mai).

Etymology. The specific epithet “ abnormis ” refers to the unique male gonarcus medially with a pair of long, hook-like projections, only present in the new species in Dilar .

Remarks. Although it is not a remarkable species based on the appearance, the male genitalia of this new species is unique among all Dilar species by the gonarcus medially with a pair of long projections. In all the other known species of Dilar , the gonarcus is slender, beam-shaped sclerite, medially without any projection.

Figures

FIGURES 1 – 5. Adults of Dilar spp. 1. D. abnormis Zhang, Liu & Winterton, sp. nov., male holotype; 2. D. grandis (Banks), male holotype; 3. D. lineatus Zhang, Liu & Winterton, sp. nov., male holotype; 4. D. loeinensis Zhang, Liu & Winterton, sp. nov., male holotype; 5. D. macleodi Oswald & Schiff, male paratype.

FIGURES 11 – 17. Dilar abnormis Zhang, Liu & Winterton, sp. nov. 11. Male genitalia, dorsal view; 12. Male genitalia, ventral view; 13. Male genitalia, lateral view; 14. Male gonarcus, dorsal view; 15. Male ectoproct, caudal view; 16. Female genitalia, lateral view; 17. Female genitalia, ventral view. bc: bursa copulatrix; cg: colleterial gland; e: ectoproct; gx 11: eleventh gonocoxites (= gonarcus); gx 9: ninth gonocoxite; gx 10: tenth gonocoxite; hi: hypandrium internum; S 7 – 9: sternum 7 – 9; T 7 – 9: tergum 7 – 9. Scale bars: 0.5 mm.