Dilar sinicus Nakahara

Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2014, Revision of Chinese Dilaridae (Insecta: Neuroptera) (Part I): Species of the genus Dilar Rambur from northern China, Zootaxa 3753 (1) : -

Dilar sinicus Nakahara

( Figs. 3 , 18–23 )

Dilar sinicus Nakahara, 1957: 31 . Type locality: China (Shanxi: Henglingkuan and Wangmaochen).

Diagnosis. The males of this species are characterized by the marking pattern of mesonotum with a brown marking on anterior half of scutellum and a pair of dark brown oblique stripes laterally, the forewings with dense small dark markings, and the male gonarcus/ninth gonocoxite complex with rather short ninth gonocoxites (shorter than 1/3 length of tenth gonocoxite) and slenderly elongate tenth gonocoxites. The females of this species are characterized by the basal part of bursa copulatrix with a transverse sclerotized area, which is slightly projected medially.

Description. Male. Body length 4.1–6.2 mm; forewing length 8.4–11.1 mm, hindwing length 7.2–9.5 mm.

Head ( Fig. 3 ) yellowish brown, with pale yellow setose tubercles. Compound eyes black. Antenna with ca. 27 segments, pale yellowish brown; flagellum unipectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 3.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate, last seven flagellomeres simple.

Thorax ( Fig. 3 ) pale yellowish brown; pronotum nearly hexagonal, with anterior margin and posterolateral corners yellow, medially with a pair of ovoid markings; mesonotum dark brown on anterior and lateral margins, with a brown marking on anterior half of scutellum, and with a pair of dark brown oblique stripes lateral to scutellum; metanotum slight darker on lateral margins. Legs pale yellowish brown, with femora blackish brown at tip. Wings ( Fig. 3 ) pale yellow, nearly hyaline, with numerous dark spots. Forewing ~2.2 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, a immaculate area present distal to median nygma; three nygmata present on proximal and median portion, median one much larger than rest two near wing base. Hindwing ~2.0 times as long as wide, slightly paler than forewing, with similar marking pattern; one nygma present at middle. Veins pale yellow, crossveins much paler than longitudinal veins. Forewing with trichosors present along wing margin between R and CuA; costal crossveins simple, but occasionally forked; Sc terminally leaving several weak veinlets; Rs with four or five main branches; MA fused with R at wing base, proximally with no crossvein connecting to MP; MP with two main branches; two gradate crossveins present at middle, inconspicuous due to pale coloration. Hindwing with trichosors present along wing margin between R and CuA; Rs with three to five main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite ( Fig. 18 ) in dorsal view shallowly incised anteriorly and posteriorly with a deeply V-shaped incision, leaving a pair of subtriangular hemitergites, which are obtuse distally and densely haired; in lateral view broad, with nearly truncate ventral margin and arcuately convex posterior margin. Ninth sternite ( Fig. 19 ) much shorter than ninth tergite, arcuately convex posteriad in ventral view. Ectoproct ( Figs. 18, 21 ) in dorsal view nearly trapezoidal, with slightly arcuate anterolateral margins, posterodorsally with a pair of short and flattened projections, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Gonarcus/ninth gonocoxite complex ( Fig. 18 ) comprising two pairs of sclerites (i.e. ninth and tenth gonocoxites) and a transversely narrow sclerite (i.e. gonarcus = eleventh gonocoxites); ninth gonocoxite rather short, proximally broad, with acutely pointed tip; tenth gonocoxite slenderly elongate, more than 3.0 times as long as ninth gonocoxite, with slightly incurved and acutely pointed base, and with spinous tip; gonarcus slenderly beam-shaped, and feebly arcuate, laterally connecting to bases of ninth gonocoxites. Hypandrium internum ( Fig. 19 ) subtriangular.

Female. Body length 4.0 mm; forewing length 8.9 mm, hindwing length 8.2 mm.

Seventh sternite ( Fig. 22 ) in lateral view subquadrate, in ventral view with truncate posterior margin. Eighth abdominal segment with subgenitale absent. Bursa copulatrix ( Fig. 22 ) with colleterial gland tubular and elongate, strongly curved and distinctly inflated distally; basal part of bursa copulatrix ( Fig. 23 ) subtrapezoidal in ventral view, anterodorsal portion with a transverse sclerotized area, which is slightly projected medially; bursal accessory gland ( Fig. 23 ) paired, slenderly tubular, distinctly incurved, with acutely pointed tip. Ectoproct ( Fig. 22 ) rather small, ovoid.

Materials examined. 1♂, CHINA: Hebei Province, Yuxian, Mt. Xiaowutaishan, Jinhekou [39°50'N, 114°47'E], 1.VII.2004, Xingyue Liu ( CAU); 1♂, CHINA: Gansu Province, Dangchang [33°46'N, 104°01'E], 23.VII.1980, Renjian Luo ( CAU); 1♂, CHINA: Neimenggu Autonomous Region, Mt. Helanshan, Shuimogou [38°54'N, 105°58'E], 5.VIII.2012, Yanlin Tian ( CAU); 1♂, CHINA: Shaanxi Province, Ganquan, Qingquangou [36°28'N, 109°35'E], 25.V.1971, Chikun Yang ( CAU); 1♂, CHINA: Shaanxi Province, Mt. Huashan, Qingkeping [34°49'N, 110°09'E], 19.VI.1956, Chikun Yang ( CAU); 1♂, CHINA: Shaanxi Province, Yan-an [35°21′N, 107°41′E], 27.VI.1973, Jinghui Luo ( CAU); 1♂, CHINA: Shaanxi Province, Dingbian [36°49'N, 107°15'E], 10.VIII.1976, Chou Tian ( CAU); 1♂, CHINA: Shanxi Province, Xixian [36°30′N, 110°55'E], 23.VI.1916 ( CAU); 1♀, CHINA: Shanxi Province, Daning [36°16′N, 110°27′E], 10.VI.1916 ( CAU).

Distribution. China (Gansu, Hebei, Neimenggu, Shaanxi, Shanxi).

Remarks. See Remarks under D. hastatus sp.nov.

Figures

FIGURES 1 – 5. Adults of Dilar spp. 1. D. hastatus sp. nov., male holotype; 2. D. septentrionalis Navás, male; 3. D. sinicus Nakahara, male; 4. D. spectabilis sp. nov., male holotype; 5. D. taibaishanus sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 18 – 23. Dilar sinicus Nakahara. 18. Male genitalia, dorsal view; 19. Male genitalia, ventral view; 20. Male genitalia, lateral view; 21. Male ectoproct, caudal view; 22. Female genitalia, lateral view; 23. Female genitalia, ventral view. ag: bursal accessory gland; cg: colleterial gland; e: ectoproct; g: gonarcus = eleventh gonocoxites; gx 9: ninth gonocoxite; gx 10: tenth gonocoxite; hi: hypandrium internum; sb: sclerite at the basal part of the bursa copulatrix; S 7 – 9: sternite 7 – 9; T 7 – 9: tergite 7 – 9. Scale bars: 0.5 mm.