Dilar dongchuanus Yan

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 : 476-477

Dilar dongchuanus Yan g

( Figs. 11 , 64–67 )

Dilar dongchuanus Yang, 1986: 155 . Type locality: China (Yunnan: Dongchuan)

Diagnosis. This species is characterized by the forewings with many pale spots mostly connected with each other, the strongly inflated male ninth gonocoxite with ventrally curved unguiform tip, and the slenderly elongate tenth gonocoxite with spinous tip.

Description. Male. Body length 6.0 mm; forewing length 10.2 mm, hindwing length 8.4 mm.

Head yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 27 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; branch on 1st flagellomere short and dentate, distal six flagellomeres simple.

Prothorax brown, pronotum yellowish brown, with anterior margin and posterolateral corners slightly paler, medially with a pair of ovoid markings; mesothorax yellowish brown, scutellum brown, laterally with a pair of yellowish brown oblique stripes; 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 brownish spots. Forewing ~2.1 times as long as wide, densely spotted, most spots connected with each other, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygmata; two nygmata present on proximal and median portions of forewing, median one much larger than the other one near wing base. Hindwing ~2.1 times as long as wide, much paler than forewing, with almost no marking; one nygma present at middle. Veins pale brown. Forewing with trichosors present along wing margin between R and CuA; 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 five main branches.

Abdomen yellowish brown, pregenital segments dorsally dark brown. Ninth tergite in dorsal view with a deeply arcuate anterior incision and a deeply V-shaped posterior incision, leaving rather narrow median portion and a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 64 ); in lateral view broad ( Fig. 66 ), with arcuate posterior margin. Ninth sternite considerably shorter than ninth tergite, truncately posteriad. Ectoproct in dorsal view terminally with a pair of unguiform projections curved ventrad, in ventral view medially with a pair of oblong and flattened projections and a pair of bifid unguiform projections. Ninth gonocoxite ( Fig. 64 ) strongly inflated, with unguiform tip curved ventrad in dorsal view; tenth gonocoxite slenderly elongate, connecting to ninth gonocoxites medially, with spinous tip; gonarcus slender, W-shaped, laterally connecting to base of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Yunnan Province, Dongchuan, Luoxuetangde [26°05'N, 103°11'E], 10.V.1980 ( CAU).

Distribution. China (Yunnan).

Remarks. This species appears to be closely related to D. megalopterus Yang in having similar forewing marking patterns and male with strongly inflated ninth gonocoxites and slenderly elongate tenth gonocoxites, but can be distinguished from D. megalopterus Yang by the narrower wings and by the male ninth gonocoxite with ventrally curved unguiform tip in dorsal view. In D. megalopterus , the wings are much broader and the male ninth gonocoxite has a bifid, unguiform tip.

Figures

FIGURES 10 – 12. Adults of Dilar spp. 10. D. yangi sp. nov., male holotype; 11. D. dongchuanus Yang, male holotype; 12. D. megalopterus Yang, male holotype. Scale bars: 1.0 mm.

FIGURES 64 – 67. Dilar dongchuanus Yang. 64. Male genitalia, dorsal view; 65. Male genitalia, ventral view; 66. Male genitalia, lateral view; 67. Male ectoproct, caudal view. Scale bars: 0.5 mm.