Dilar hastatus, Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2014

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 hastatus sp.nov.

( Figs. 1 , 6–11 )

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 tenth gonocoxite slenderly elongate (nearly 2.0 times as long as ninth gonocoxite). The females of this species are characterized by basal part of bursa copulatrix with a transverse sclerotized area, which is slightly projected medially.

Description. Male. Body length 5.3–6.2 mm; forewing length 11.9–12.3 mm, hindwing length 9.5–10.2 mm. Head ( Fig. 1 ) pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 29 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 ( Fig. 1 ) pale yellow, pronotum pale brown, with anterior margin and posterolateral corners yellow, medially with a pair of ovoid markings; mesothorax pale yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with anterior half brown, laterally with a pair of dark brown oblique stripes; metanotum pale yellowish brown, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings ( Fig. 1 ) hyaline, slightly smoky brown, with numerous dark spots. Forewing ~2.4 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygma; 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, 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 just touching R in pterostigmatic region, 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 four main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite ( Fig. 6 ) in dorsal view with a nearly truncate or arcuate anterior incision and a deeply V-shaped posterior incision, leaving rather narrow median portion and a pair of subtriangular hemitergites, which are obtuse distally and densely haired; in lateral view broad, with straight ventral margin and arcuate posterior margin. Ninth sternite ( Fig. 7 ) obviously shorter than ninth tergite, arcuately convex posteriad. Ectoproct ( Figs. 6, 9 ) in dorsal view nearly trapezoidal, posterodorsally with a pair of short and flattened projections, which are serrate at tip, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Gonarcus/ninth gonocoxite complex ( Fig. 6 ) comprising two pairs of long sclerites (i.e. ninth and tenth gonocoxites) and a transversely narrow sclerite (i.e. gonarcus = eleventh gonocixites); ninth gonocoxite slenderly elongate, with anterior half broadly spoon-shaped and with posterior half slightly incurved and unguiform at tip; tenth gonocoxite slenderly elongate, nearly 2.0 times as long as ninth gonocoxite, with slightly incurved and acutely pointed base and with spinous tip; gonarcus slenderly beam-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum ( Fig. 7 ) narrowly trapezoidal, with lateral margins slightly arcuate.

Female. Body length 5.7–6.6 mm; forewing length 11.5–12.6 mm, hindwing length 9.4–10.6 mm.

Seventh sternite ( Fig. 10 ) in lateral view nearly subquadrate, in ventral view subquadrate, with truncate posterior margin. Eighth abdominal segment without subgenitale. Bursa copulatrix ( Fig. 10 ) with colleterial gland tubular, relatively short, with distal half slightly inflated; basal part of bursa copulatrix ( Fig. 10–11 ) sac-like in lateral view but subtrapezoidal in ventral view, anterior portion broadened with a transverse sclerotized area, which is slightly projected medially. Ectoproct ( Fig. 10 ) rather small, ovoid.

Type materials. Holotype ♂, CHINA: Hebei Province, Zhuolu, Yangjiaping [39°58'N, 115°23'E], 3.VII.2005, Xingyue Liu ( CAU). Paratypes 3♂, CHINA: Beijing, Mentougou, Xiaolongmen [35°06'N, 115°09'E], 1300m, 12.VII.2005, Bingzhen Yan ( CAU); 2♂ 1♀, CHINA: Beijing, Mentougou, Xiaolongmen, 1250m, 9.VII.2011, Horst & Ulrike Aspöck (1♂ 1♀ in HUAC and 1♂ in CAU); 5♂, CHINA: Beijing, Mentougou, Xiaolongmen, 1300m, 25.VI.2012, Xuankun Li ( CAU); 4♀, CHINA: Beijing, Mentougou, Xiaolongmen, 1200m, 23.VI.2012, Xuankun Li ( CAU); 1♂, CHINA: Hebei Province, Huailai [40°24'N, 115°30'E], 16.VI.1930 ( CAU).

Distribution. China (Beijing, Hebei).

Etymology. The specific epithet “ hastatus ” (= spear carrier) refers to the slenderly elongate and terminally acute male tenth gonocoxites in the new species. It is a noun in the nominative case masculine singular being an apposition to the genus name.

Remarks. The new species appears to be closely related with D. sinicus Nakahara in having similar marking pattern on mesonotum and male genitalia with elongate tenth gonocoxite, which is feebly curved anteriorly, but it can be distinguished from the latter species by the male gonarcus/ninth gonocoxite complex with tenth gonocoxite nearly 2.0 times as long as ninth gonocoxite. In D. sinicus Nakahara , the tenth gonocoxite is more than 3.0 times as long as ninth gonocoxite.

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 6 – 11. Dilar hastatus sp. nov. 6. Male genitalia, dorsal view; 7. Male genitalia, ventral view; 8. Male genitalia, lateral view; 9. Male ectoproct, caudal view; 10. Female genitalia, lateral view; 11. Female genitalia, ventral view. Scale bars: 0.5 mm.