Dilar bifurcatus, Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2015

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 : 455-463

Dilar bifurcatus sp. nov.

( Figs. 1 , 20–23 )

Diagnosis. This species is characterized by the forewings with numerous brown markings, the male ninth gonocoxite bifurcated on distal half, and the slenderly elongate male tenth gonocoxite which is hook-like at base.

Description. Male. Body length 5.3 mm; forewing length 10.1 mm, hindwing length 8.9 mm.

Head pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 28 segments, 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, distal six flagellomeres simple.

Prothorax pale yellow, pronotum pale brown, with anterior margin and posterolateral corners brown; mesothorax pale yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with posterior half brown; metanotum pale yellowish brown, slightly darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings transparent, slightly smoky brown, with numerous yellowish brown 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; three nygmata present on proximal and median portion of forewing, median one slightly larger than rest two near wing base. Hindwing ~2.6 times as long as wide, slightly paler than forewing; one large nygma present at middle. Veins pale yellow, crossveins slightly paler than longitudinal veins. 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 four main branches. Hindwing with trichosors present along wing margin between R and CuP; Rs with four main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving rather narrow median portion and a pair of subtriangular hemitergites ( Fig. 20 ), which are obtuse distally and densely haired; in lateral view broad ( Fig. 22 ), with straight ventral margin and arcuate posterior margin. Ninth sternite considerably shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view nearly semicircular, posterodorsally with a pair of short and flattened subovoid projections, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 20 ) strongly inflated on proximal half, distinctly narrowed and bifurcated on distal half; tenth gonocoxite slenderly elongate, much longer than ninth gonocoxite, with hook-like base and spinous tip; gonarcus beam-shaped, slightly expanded on both ends, laterally connecting to bases of ninth gonocoxites. Hypandrium internum trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Jiangxi Province, Mt. Lushan [29°33′N, 115°58′E], 27.VI.1963 ( CAU).

Distribution. China (Jiangxi).

Etymology. The specific epithet “ bifurcatus ” refers to the male ninth gonocoxite, which is bifurcated in the distal half in the new species.

Remarks. The new species appears to be closely related to D. tianmuanus Yang in having similar forewing marking patterns and male gonocoxite complexes 9, 10 and 11 with slenderly elongate tenth gonocoxite, which is hook-like at base and spinous at tip, but it can be distinguished from the latter species by the male ninth gonocoxite which is bifurcated on distal half. In D. tianmuanus Yang , the ninth gonocoxite is angulately curved on distal half with unguiform tip.

Figures

FIGURES 1 – 3. Adults of Dilar spp. 1. D. bifurcatus sp. nov., male holotype; 2. D. chebalingensis sp. nov., male holotype; 3. D. longidens sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 20 – 23. Dilar bifurcatus sp. nov. 20. Male genitalia, dorsal view; 21. Male genitalia, ventral view; 22. Male genitalia, lateral view; 23. Male ectoproct, caudal view. Scale bars: 0.5 mm.