Dilar yangi, 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 : 475-476

Dilar yangi sp. nov.

( Figs. 10 , 60–63 )

Diagnosis. This species is characterized by the forewings with many dark stripes, by the presence of a long rectangular dorsoprocessus of the male ninth tergite, and by the male suboblong ninth gonocoxites and proximally strongly incurved tenth gonocoxites bearing spinous tip.

Description. Male. Body length 3.1–5.7 mm; forewing length 6.0– 6.9 mm, hindwing length 5.1–6.1 mm.

Head yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 26 segments, yellowish brown, pedicel with brown annular stripes, flagellum unipectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 5.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate, distal eight flagellomeres simple.

Prothorax pale yellowish brown, pronotum yellowish brown, with anterior margin and posterolateral corners pale yellow, 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, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings transparent, slightly smoky brown, with numerous dark stripes. Forewing ~2.0 times as long as wide, densely stripped, arranging as transversely arcuate pattern; 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 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 just touching R in pterostigmatic region, terminally leaving several weak veinlets; Rs with four main branches. Hindwing with trichosors present along wing margin between R and CuA; Rs with four main branches.

Abdomen yellowish brown, pregenital segments dorsally dark brown. Ninth tergite in dorsal view with an arcuate anterior incision and a deeply U-shaped posterior incision which is medially with a long rectangular dorsoprocessus, leaving a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 60 ); in lateral view broad ( Fig. 62 ), with straight ventral margin and arcuate posterior margin. Ninth sternite much shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view subquadrate, posterodorsally with two pairs of pointy projections, posteroventrally with a pair of subsemicircular flattened projections, a pair of pointy projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 60 ) suboblong, with anterior half inflated and with posterior half slightly narrowed and obtuse at tip in dorsal view; tenth gonocoxite slenderly elongate, which is connecting to ninth gonocoxites near base, with strongly incurved base and with spinous tip; gonarcus slendely beam-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum narrowly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Guangxi Province, Wuming, Mt. Damingshan [23°24'N, 108°28'E], 1015 m, 26.V.2011, Kaiqin Li ( CAU). Paratypes 1♂, CHINA: Guangxi Province, Wuming, Mt. Damingshan [23°24'N, 108°28'E], 28.V.2011, Tingting Zhang ( CAU); 3♂, CHINA: Guangxi Province, Wuming, Mt. Damingshan [23°24'N, 108°28'E], 1015 m, 23.V.1963, Chikun Yang ( CAU).

Distribution. China (Guangxi).

Etymology. The new species is dedicated to the late Prof. Chikun Yang ( China Agricultural University, Beijing), who made significant contributions to the taxonomy of Chinese Dilaridae .

Remarks. This new species appears to be closely related to D. insularis Zhang, Liu & U. Aspöck in having similar forewing marking patterns, which has many orderly arranged dark stripes, and in having the male gonocoxite complexes 9, 10 and 11 with similarly shaped ninth gonocoxites and with tenth gonocoxites strongly incurved at base and spinous at tip. However, it differs from the latter species by the male ectoproct. In D. yangi the male ectoproct has two pairs differently lengthed pointy posterodorsal projections and a pair of pointy posteroventral projections. In D. insularis the male ectoproct posterodorsally has two pairs of laterally curved, unguiform projections, which are of similar length, and has a pair of bifid unguiform posteroventral projections.

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 60 – 63. Dilar yangi sp. nov. 60. Male genitalia, dorsal view; 61. Male genitalia, ventral view; 62. Male genitalia, lateral view; 63. Male ectoproct, caudal view. Scale bars: 0.5 mm.