Dilar guangxiensis, 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 : 473-474

Dilar guangxiensis sp. nov.

( Figs. 9 , 54–59 )

Diagnosis. This species is characterized by the forewings with many pale stripes arranging as transversely arcuate pattern, the male ninth tergite with a subrectangular dorsoprocessus in dorsal view, and by male with tenth gonocoxites submedially bearing a pointy lobe connecting to ninth gonocoxite.

Description. Male. Body length 2.7 mm; forewing length 6.2 mm, hindwing length 5.5 mm.

Head pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 26 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 seven flagellomeres simple.

Prothorax pale yellow, pronotum pale brown, with anterior margin and posterolateral corners yellow, medially with a pair of ovoid markings; mesothorax pale yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with posterior half 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 pale stripes. Forewing ~2.4 times as long as wide, densely spotted, proximal stripes 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 ~2.6 times as long as wide, slightly paler than forewing, with similar marking pattern; 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 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 yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite in dorsal view with an arcuate anterior incision and a nearly U-shaped posterior incision which is medially with a subrectangular dorsoprocessus, leaving a wide median portion and a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 54 ); in lateral view broad ( Fig. 56 ), with straight ventral margin and arcuate posterior margin. Ninth sternite considerably shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view subquadrate, posterolaterally with a pair of cornute projections, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 54 ) suboblong, in dorsal view with incurved and unguiform tip; tenth gonocoxite slightly incurved, slightly longer than ninth gonocoxite, with slender base and truncate tip, submedially with a pointy lobe connecting to ninth gonocoxite; gonarcus slendely beam-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Body length 4.4 mm; forewing length 7.2 mm, hindwing length 5.6 mm.

Seventh sternite in lateral view nearly trapezoidal, in ventral view nearly rectangular, with truncate posterior margin. Eighth abdominal segment without sclerotized subgenitale. Bursa copulatrix with colleterial gland tubular and elongate, curved; basal part of bursa copulatrix presents as a ventrally curved sac in lateral view and subtrapezoidal in ventral view; bursal accessory gland not observed. Ectoproct small, ovoid.

Materials examined. Holotype ♂, CHINA: Guangxi Province, Huaping, Hongtan [25°15'N, 110°11'E], 25.VI.1982, Fasheng Li ( CAU). Paratypes 2♂, CHINA: Guangxi Province, Guigang, Mt. Tianpingshan [23°08'N, 109°26'E], 25.VI.1982, Chikun Yang ( CAU); 1♂, CHINA: Guangxi Province, Longsheng, Mt. Tianpingshan [23°08'N, 109°26'E], 740m, 4.VI.1963, Chunguang Wang ( IZCAS); 1♀, CHINA: Guangxi Province, Guigang, Mt. Tianpingshan [23°08'N, 109°26'E], 25.VI.1982, Chikun Yang ( CAU); 1♂, CHINA: Guizhou Province, Leishan, Mt. Leigongshan [26°44'N, 108°27'E], 895m, 20.VII.2014, Lu Yue ( CAU).

Distribution. China (Guangxi, Guizhou).

Etymology. The species is named after Guangxi, which is the type locality of the new species. Remarks. The new species is closely related to D. tibetanus Yang by having the suboblong ninth gonocoxite and the tenth gonocoxite with very slender base. However, this species can be distinguished from the latter species by the subquadrate male ectoproct, posterolaterally with a pair of cornute projections and by the male tenth gonocoxite with truncate tip. In D. tibetanus the male ectoproct in dorsal view has a deeply arcuate anterior incision, posterodorsally with a pair of unguiform projections curved ventrally.

Figures

FIGURES 7 – 9. Adults of Dilar spp. 7. D. wuyianus Yang, male holotype; 8. D. dulongjiangensis sp. nov., male holotype; 9. D. guangxiensis sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 54 – 59. Dilar guangxiensis sp. nov. 54. Male genitalia, dorsal view; 55. Male genitalia, ventral view; 56. Male genitalia, lateral view; 57. Male ectoproct, caudal view. 58. Female genitalia, lateral view; 59. 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: sternite 7 – 9; T 7 – 9: tergite 7 – 9. Scale bars: 0.5 mm.