Dilar tianmuanus 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 : 468-469

Dilar tianmuanus Yan g

( Figs. 6 , 40–43 )

Dilar tianmuanus Yang, 2001: 306 . Type locality: China (Zhejiang: Lin-an).

Diagnosis. This species is characterized by the forewings with many pale stripes arranging as transversely arcuate pattern, the male ninth gonocoxite broadly spoon-shaped on proximal half and angulately curved on distal half, and the slender male tenth gonocoxite, which is slightly shorter than ninth gonocoxite with spinous tip.

Description. Male. Body length 5.9 mm; forewing length 9.8 mm, hindwing length 7.8 mm.

Head yellowish brown, with pale yellow setose tubercles; compound eyes blackish brown; antenna 27- segmented, 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, last six flagellomeres simple.

Prothorax yellowish brown, pronotum nearly hexagonal, pale brown, posterolateral corners dark brown; mesothorax yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with posterior half dark brown, laterally with a pair of dark brown oblique stripes; metanotum pale yellowish brown, slight darker on lateral margins. Legs pale yellowish brown, femora black brown at tip. Wings transparent, with numerous pale spots. Forewing ~2.4 times as long as wide, densely striped, with markings on costal area and proximal half much darker, arranging as transversely arcuate pattern; three nygmata present on proximal and median portion of forewing, median one much larger than rest two near wing base. Hindwing ~2.6 times as long as wide, slightly paler than forewing, almost immaculate; one nygma present at middle. Veins pale brown, crossveins slightly darker 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 five main branches. Hindwing with trichosors present along wing margin between R and CuA; Rs with five main branches.

Abdomen brown, pregenital segments dorsally dark yellowish brown. Ninth tergite in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving relatively narrow median portion and a pair of subtriangular hemitergites, which have obtuse apices and densely haired ( Fig. 40 ); in lateral view broad ( Fig. 42 ), with straight ventral margin and arcuate posterior margin. Ninth sternite considerably shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view nearly trapezoidal, posteroventrally with a pair of short and flattened projections, posterodorsally with a pair of bifid unguiform projections, a pair of short, feebly sclerotized, digitiform projections and a strong sclerotized rectangular projection, which is serrate at tip. Ninth gonocoxite ( Fig. 40 ) broadly spoon-shaped on proximal half and angulately curved on distal half, with unguiform tip; tenth gonocoxite slenderly elongate, slightly shorter than ninth gonocoxite, with spinous tip, proximally connecting to gonarcus, submedially with a lobe connecting to ninth gonocoxite; gonarcus beam-shaped, which is nearly U-shaped, expanded on both ends, laterally connecting to bases of ninth gonocoxites. Hypandrium internum subtrapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Zhejiang Province, Lin-an, Mt. Tianmushan [30°19'N, 119°25'E], 1090 m, 28.VI.1957, Chikun Yang ( CAU). CHINA: 3♂, Anhui Province, Mt. Huangshan [30°01'N, 118°01'E], 1200 m, 19.VII.1977, Fasheng Li ( CAU); 1♂, Zhejiang Province, Lin-an, Mt. Tianmushan [30°22'N, 119°26'E], 1100 m, 8.X.2012 ( CAU).

Distribution. China (Anhui [new province record], Zhejiang).

Remarks. See remarks under D. bifurcatus sp. nov.

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 40 – 43. Dilar tianmuanus Yang. 40. Male genitalia, dorsal view; 41. Male genitalia, ventral view; 42. Male genitalia, lateral view; 43. Male ectoproct, caudal view. Scale bars: 0.5 mm.