Dilar nobilis, 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 : 482-483

Dilar nobilis sp. nov.

( Figs. 15 , 82–87 )

Diagnosis. This species is characterized by the forewings having many dark spots mostly connected with each other and a big immaculate area distal to the median nygma, and by the slenderly elongate and sinuate male tenth gonocoxite, which is bifurcated submedially into a thick digitiform and a slender spinous lobe.

Description. Male. Body length 6.2 mm; forewing length 10.7 mm, hindwing length 8.9 mm.

Head yellowish brown, with pale brown setose tubercles. Compound eyes blackish brown. Antenna with ca. 27 segments, pale 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 yellowish brown, pronotum yellowish brown, with anterior margin and posterolateral corners yellow, medially with a pair of ovoid markings; mesothorax yellowish brown, mesonotum blackish brown on anterior and lateral margins, scutellum with posterior half dark brown; metanotum pale yellowish brown, slight darker on lateral margins. Legs pale yellow, femora blackish brown at tip. Wings transparent, slightly yellowish brown. Forewing ~2.0 times as long as wide, densely spotted, with markings on costal area and proximal half much darker, arranging as transversely arcuate pattern, a big immaculate area present distal to proximal nygma; two nygmata present on proximal and median portion of forewing, which are accompanied with a large brownish marking. Hindwing ~2.1 times as long as wide, much 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 main branches. Hindwing with trichosors present along wing margin between R and CuA; Rs with five main branches.

Abdomen yellow, pregenital segments dorsally dark brown. Ninth tergite in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving a pair of subtriangular hemitergites, which are obtuse distally and densely haired ( Fig. 82 ); in lateral view broad ( Fig. 84 ), with straight ventral margin and arcuate posterior margin. Ninth sternite much shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view nearly rectangular, posterodorsally with a pair of bifid unguiform projections, posteroventrally with a pair of unguiform projections and a pair of feebly sclerotized, digitiform projections. Ninth gonocoxite ( Fig. 82 ) slenderly elongate, with base broadly spoon-shaped, and with tip lanciform and strongly curved; tenth gonocoxite slenderly elongate, with anterior half incurved and with posterior half bandy, which is bifurcate submedially; gonarcus slender, nearly U-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Body length 7.4 mm; forewing length 11.2 mm, hindwing length 9.1 mm.

Seventh sternite in lateral view subtrapezoidal, in ventral view subtrapezoidal, with nearly truncate posterior margin. Eighth abdominal segment ventrally without subgenitale. Ninth tergite in lateral view slightly narrower than eighth tergum, directed posteroventrad. Bursa copulatrix with colleterial gland tubular and elongate, strongly sinuate submedially; basal part of bursa copulatrix presents as a curved sac in lateral view, with anterior half slightly sclerotized and with posterior half nearly membranous; bursal accessory gland not observed. Ectoproct small, ovoid.

Materials examined. Holotype ♂, CHINA: Yunnan Province, Lvchun, Mt. Huanglianshan [22°53′N, 102°18′E], 2060 m, 6.VI.2013, Jie Zhang ( CAU). Paratype 2♂, Yunnan Province, Lvchun, Mt. Huanglianshan [22°53′N, 102°18′E], 2060 m, 6.VI.2013, Jie Zhang ( CAU); 1♂, Yunnan Province, Xishuangbanna, Menghun [21°50′N, 100°23′E], 1300m, 21.V.1958, Leyi Zheng ( IZCAS); 1♀, Yunnan Province, Lvchun, Mt. Huanglianshan [22°53′N, 102°18′E], 2060 m, 6.VI.2013, Jie Zhang ( CAU).

Distribution. China (Yunnan).

Etymology. The Latin adjective nobilis means nobel. It refers to the particularly beautiful pattern of the wings.

Remarks. The two species, i.e. D. lijiangensis sp. nov. and D. nobilis sp. nov., of the D. lijiangensis group can be clearly distinguished by the the wing marking patterns (immaculate in D. lijiangensis but distinctly marked in D. nobilis ) and the male gonocoxites complex 9, 10 and 11 (ninth gonocoxite feebly curved and tenth gonocoxite short, distally not outcurved in D. lijiangensis ; ninth gonocoxite strongly curved distally and tenth gonocoxite elongate, distally strongly outcurved in D. nobilis ).

Figures

FIGURES 13 – 15. Adults of Dilar spp. 13. D. yunnanus Yang, male holotype; 14. D. lijiangensis sp. nov., male holotype; 15. D. nobilis sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 82 – 87. Dilar nobilis sp. nov. 82. Male genitalia, dorsal view; 83. Male genitalia, ventral view; 84. Male genitalia, lateral view; 85. Male ectoproct, caudal view. 86. Female genitalia, lateral view; 87. Female genitalia, ventral view. Scale bars: 0.5 mm.