Dilar stenopterus Yang

Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2015, Revision of Chinese Dilaridae (Insecta: Neuroptera) (Part III): Species of the genus Dilar Rambur from the southern part of mainland China, Zootaxa 3974 (4), pp. 451-494 : 467

Dilar stenopterus Yang

( Figs. 5 , 36–39 )

Dilar stenopterus Yang, 1999: 95 . Type locality: China (Fujian: Wuyishan).

Diagnosis. This species is characterized by the narrow forewings with many dark spots mostly connected with each other, by the male ninth gonocoxite slightly inflated and bifurcated proximally, with distal half strongly incurved and bifurcated, and by the incurved tenth gonocoxite, medially with a lobe connecting to ninth gonocoxite.

Description. Male. Body length 4.4 mm; forewing length 9.5 mm, hindwing length 8.2 mm.

Head yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna pale yellowish brown, pedicel with brown annular stripes, flagellum unipectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 4.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate.

Prothorax pale yellow, pronotum pale yellowish brown, with anterior margin and posterolateral corners pale yellow, medially with a pair of ovoid markings; mesothorax pale yellowish brown, mesonotum dark brown on anterior and lateral margins; metanotum pale yellowish brown, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings transparent, slightly smoky brown, with numerous dark spots. Forewing ~2.4 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygma; two nygmata present on proximal and median portion of forewing, median one much larger than the other one near wing base. Hindwing ~2.1 times as long as wide, slightly paler than forewing; one nygma present at middle. Veins pale brown. Forewing with trichosors present along wing margin between R and CuP; costal crossveins simple, but occasionally forked; Sc terminally leaving several weak veinlets; Rs with five main branches. Hindwing with trichosors present along wing margin between R and CuA; Rs with four main branches.

Abdomen pale yellowish brown, pregenital segments dorsally dark brown. Ninth tergite in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 36 ); in lateral view broad ( Fig. 38 ), with arcuate posterior margin. Ninth sternite much shorter than ninth tergite, truncately convex posteriad. Ectoproct in dorsal view truncate at tip, posterolaterally with a pair of short unguiform projections, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 36 ) slightly inflated and bifurcated proximally, with distal half strongly incurved and bifurcated; tenth gonocoxite slenderly elongate, incurved, medially with a lobe connecting to ninth gonocoxite; gonarcus slenderly beamshaped, expanded on both ends, which bear bifid tip connecting to base of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Fujian Province, Wuyishan, Mt. Huanggangshan [27°51'N, 117°46'E], 27.VI.1980, Shicheng Qi ( CAU).

Distribution. China (Fujian).

Figures

FIGURES 4 – 6. Adults of Dilar spp. 4. D. maoershanensis sp. nov., male holotype; 5. D. stenopterus Yang, male holotype; 6. D. tianmuanus Yang, male holotype. Scale bars: 1.0 mm.

FIGURES 36 – 39. Dilar stenopterus Yang. 36. Male genitalia, dorsal view; 37. Male genitalia, ventral view; 38. Male genitalia, lateral view; 39. Male ectoproct, caudal view. Scale bars: 0.5 mm.