Dilar septentrionalis Navás

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 septentrionalis Navás

( Figs. 2 , 12–17 )

Dilar septentrionalis Navás, 1912: 420 . Type locality: Russia (Vladivostok).

Diagnosis. The males of this species are characterized by the marking pattern of mesonotum with a brown marking on posterior half of scutellum, the forewings with dense small dark markings, and the male gonarcus/ninth gonocoxite complex with anteriorly strongly inflated ninth gonocoxite and elongate, anteriorly angulately curved tenth gonocoxite. The females of this species are characterized by the basal part of bursa copulatrix, which presents as a ventrally curved sac in lateral view and ovoid in ventral view, posteriorly slightly sclerotized on ventral portion.

Description. Male. Body length 4.0– 5.6 mm; forewing length 8.1–8.9 mm, hindwing length 6.9–7.8 mm.

Head ( Fig. 2 ) pale yellowish brown, with pale yellow setose tubercles, median tubercle subtriangular and margined brown. Compound eyes blackish brown. 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 5.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate, last six flagellomeres simple.

Thorax ( Fig. 2 ) pale yellow; mesonotum dark brown on anterior and lateral margins, scutellum with posterior half brown; metanotum slightly darker on lateral margins, scutellum with posterior half brown. Legs pale yellowish brown, femora blackish brown at tip. Wings ( Fig. 2 ) hyaline, slightly smoky brown, with numerous dark spots. Forewing ~2.0 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, a immaculate area present distal to median nygma; two nygmata present on proximal and median portion of forewing, median one much larger than that 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 CuP; costal crossveins simple, but occasionally forked; Sc terminally leaving several weak veinlets; Rs with four 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 CuP; Rs with five main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite ( Fig. 12 ) in dorsal view with a V-shaped anterior incision and an arched posterior incision, leaving a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired; in lateral view broad, with truncate ventral margin and arcuately convex posterior margin. Ninth sternite ( Fig. 13 ) much shorter than ninth tergite, slightly arcuately convex posteriad. Ectoproct in dorsal view ( Figs. 12, 15 ) suboblong, posterodorsally with a pair of short and flattened projections, posteroventrally with a pair of bifid unguiform projections, a pair of short, feebly sclerotized, digitiform projections, and a strong sclerotized median projection, which is curved posteroventrally and bifid at tip. Gonarcus/ninth gonocoxite complex ( Fig. 12 ) comprising two pairs of long sclerites (i.e. ninth and tenth gonocoxites) and a transversely narrow sclerite (i.e. gonarcus = eleventh gonocoxites); ninth gonocoxite in dorsal view broad on proximal half, with distal half strongly narrowed and curved posteroventrally, with unguiform tip; tenth gonocoxite slenderly elongate, much longer than ninth gonocoxite, angulately curved anteriorly, connecting to gonarcus, with spinous tip; gonarcus slenderly beam-shaped, which is V-shaped, with bifid tip connecting to base of ninth gonocoxites. Hypandrium internum ( Fig. 13 ) subtriangular, with lateral margins slightly arcuate.

Female. Body length 5.4–6.2 mm; forewing length 10.9–12.3 mm, hindwing length 9.1–10.5 mm.

Seventh sternite ( Fig. 16 ) in lateral view subtrapezoidal, in ventral view subquadrate, with truncate posterior margin. Eighth abdominal segment with subgenitale absent. Bursa copulatrix ( Fig. 16 ) with colleterial gland tubular and elongate, strongly curved distally; basal part of bursa copulatrix ( Fig. 16–17 ) presents as a ventrally curved sac in lateral view and ovoid in ventral view, posteriorly slightly sclerotized on ventral portion; bursal accessory gland not observed. Ectoproct ( Fig. 16 ) rather small, ovoid.

Materials examined. 1♂ 1♀, CHINA: Liaoning Province, Xinbin [41°14′N, 124°15′E], 714m, 5.VIII.2009, Maoling Sheng ( CAU); 1♀, CHINA: Liaoning Province, Huanren [41°15′N, 125°21′E], 24.VII.2009; 3♀, CHINA: Liaoning Province, Kuandian Mt.tianhuashan [40°43′N, 124°46′E], 380m, 12.VII.2009, Junchao Wang ( CAU); 1♂, CHINA: Jilin Province, Jiaohe, Mt. Lafashan [43°42′N, 127°12′E], 20.VII.1990, Chikun Yang ( CAU).

Distribution. China (Jilin, Liaoning); Korea; Russia Far East.

Remarks. See Remarks under D. taibaishanus 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 12 – 17. Dilar septentrionalis Navás. 12. Male genitalia, dorsal view; 13. Male genitalia, ventral view; 14. Male genitalia, lateral view; 15. Male ectoproct, caudal view; 16. Female genitalia, lateral view; 17. Female genitalia, ventral view. Scale bars: 0.5 mm.