Dilar chebalingensis, 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 : 463-465

Dilar chebalingensis sp. nov.

( Figs. 2 , 24–27 )

Diagnosis. This species is characterized by the forewings with numerous yellowish brown stripes arranging as transversely arcuate pattern, the male ninth gonocoxite inflated on proximal half and bifurcated on distal half, and the slenderly elongate male tenth gonocoxite submedially with a lobe connecting to ninth gonocoxite.

Description. Male. Body length 4.2–7.3 mm; forewing length 6.7–11.7 mm, hindwing length 5.8–10.3 mm.

Head pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 25 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 yellowish brown, with anterior margin and posterolateral corners pale 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 brown stripes. Forewing ~2.1 times as long as wide, densely striped, 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 ~2.0 times as long as wide, slightly paler than forewing; one nygma present at middle. Veins pale brown. 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 or six main branches. Hindwing with trichosors present along wing margin between R and CuP; Rs with four or five main branches.

Abdomen pale yellowish brown, pregenital segments dorsally dark brown. Ninth tergite in dorsal view with an arcuate anterior incision and a nearly U-shaped posterior incision, leaving a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 24 ); in lateral view broad ( Fig. 26 ), with straight ventral margin and arcuate posterior margin. Ninth sternite much shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view nearly trapezoidal, posteroventrally with a pair of short and flattened projections, posterodorsally with tip serrate, with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 24 ) strongly inflated on proximal half and bifurcated on distal half, curved downward in dorsal view; tenth gonocoxite slenderly elongate, nearly 2.0 times as long as ninth gonocoxite, incurved at base and with spinous tip, submedially with a lobe connecting to ninth gonocoxite; gonarcus slenderly beam-shaped, nearly U-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Guangdong Province, Shixing, Chebaling [24°40'N, 114°09'E], 23.IV.1991, Fasheng Li ( CAU). Paratype 1♂, CHINA: Hunan Province, Changde, Hupingshan [29°56'N, 110°46'E], 5.VI.2008, Li Shi ( CAU).

Distribution. China (Guangdong, Hunan).

Etymology. The specific epithet “ chebalingensis ” refers to the locality of the holotype, i.e. Chebaling, of the new species.

Remarks. The new species is closely related to D. bifurcatus sp. nov. in having similar forewing marking patterns, male ninth gonocoxite which is inflated on proximal half and bifurcated on distal half, and slenderly elongate male tenth gonocoxite. However, it differs from the latter species by the male ninth tergite in dorsal view with a nearly U-shaped posterior incision, leaving a pair of subtrapezoidal hemitergites and wide median portion and by the male ectoproct with serrate tip in dorsal view. In D. bifurcatus sp. nov., the male ninth tergite in dorsal view with a V-shaped posterior incision, leaving a pair of subtriangular hemitergites and rather narrow median portion and the male ectoproct posterodorsally with a pair of short and flattened ovoid projections.

Dilar longidens sp. nov. ( Figs. 3 , 28–31 )

Diagnosis. This species is characterized by the forewings with numerous pale yellowish brown stripes arranged as transversely arcuate pattern, and by the incurved, slenderly elongate male tenth gonocoxite which is nearly 2.0 times as long as ninth gonocoxite.

Description. Male. Body length 6.0– 6.8 mm; forewing length 8.9–9.8 mm, hindwing length 7.6–8.2 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 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 pale 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 pale yellowish brown stripes. Forewing ~2.2 times as long as wide, densely spotted, proximal stripes slightly darker, arranging as transversely arcuate pattern; two nygmata present on proximal and median portion of forewing, median one much larger than the other near wing base. Hindwing ~2.1 times as long as wide, slightly paler than forewing, with almost no marking; one nygma present at middle. Veins pale yellow, crossveins much 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 five main branches.

Abdomen yellowish brown, pregenital segments dorsally brown. Ninth tergite in dorsal view with an arched anterior incision and a shallowly U-shaped posterior incision, leaving a pair of wide subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 28 ); in lateral view broad ( Fig. 30 ), with truncate ventral margin and arcuately convex posterior margin. Ninth sternite much shorter than ninth tergite, slightly arcuately convex posteriad. Ectoproct in dorsal view with a pair of small unguiform projections at tip, posteroventrally with a pair of short and flattened projections, a pair of unguiform projection and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 28 ) in dorsal view broadly spoon-shaped on proximal half, slenderly elongate, with unguiform and decurved tip; tenth gonocoxite incurved, slenderly elongate, which is nearly 2.0 times as long as ninth gonocoxite, medially with a projection connecting to ninth gonocoxite; gonarcus slenderly beam-shaped, which is nearly U-shaped, slightly inflated on both ends, laterally connecting to base of ninth gonocoxites. Hypandrium internum subtrapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Guangxi Province, Guilin, Huaping, Hongtan [25°15'N, 110°11'E], 200 m, 11.VI.1963, Chikun Yang ( CAU). Paratypes 1♂, CHINA: Guangxi Province, Guilin, Huaping, Cujiang [25°15'N, 110°11'E], 200 m, 6.VI.1963, Chikun Yang ( CAU); 1♂, CHINA: Guangxi Province, Guilin, Longsheng, Cujiang [25°15'N, 110°11'E], 840m, 7.VI.1963, Shuyong Wang ( CAU).

Distribution. China (Guangxi).

Etymology. The specific epithet “ longidens ” refers to the slenderly elongate male tenth gonocoxite which is nearly 2.0 times as long as the ninth gonocoxite in the new species.

Remarks. This species appears to be closely related to D. maoershanensis sp. nov. in the slenderly elongate male tenth gonocoxite which is nearly 2.0 times as long as ninth gonocoxite, but it can be distinguished from D. maoershanensis sp. nov. by the male ninth gonocoxite with slender distal half with tip unguiform and curved ventrally. In D. maoershanensis , the ninth gonocoxite is slightly inflated, with strongly sclerotized and forked 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 24 – 27. Dilar chebalingensis sp. nov. 24. Male genitalia, dorsal view; 25. Male genitalia, ventral view; 26. Male genitalia, lateral view; 27. Male ectoproct, caudal view. Scale bars: 0.5 mm.

FIGURES 28 – 31. Dilar longidens sp. nov. 28. Male genitalia, dorsal view; 29. Male genitalia, ventral view; 30. Male genitalia, lateral view; 31. Male ectoproct, caudal view. Scale bars: 0.5 mm.