Dilar hikosanus Nakahara, 1955

Zhang, Wei, Liu, Xingyue, Aspoeck, Horst, Winterton, Shaun L. & Aspoeck, Ulrike, 2014, Species of the pleasing lacewing genus Dilar Rambur (Neuroptera, Dilaridae) from islands of East Asia, Deutsche Entomologische Zeitschrift 61 (2), pp. 141-153 : 142

Dilar hikosanus Nakahara, 1955 Figs 2, 13-16

Dilar hikosanus Nakahara, 1955b: 137. Type locality: Japan (Fukuoka).

Diagnosis.

This species is characterized by the forewings with numerous brown stripes, and the male ectoproct in dorsal view with a pair of parallel prolongations which are truncate and serrate at tip.

Description. Male. Body length 4.7 mm; forewing length 8.3 mm, hindwing length 6.8 mm.

Head 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 3.0 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; metanotum pale yellowish brown, slightly darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings hyaline, slightly yellowish brown, with numerous brown spots. Forewing ~2.2 times as long as wide, densely spotted, with markings on proximal half much darker, most markings connected with each other, generally arranging into several arcuate transverse stripes, an immaculate area present distal to median nygma; two nygmata present on proximal and median portion of forewing, median one much larger than proximal one. Hindwing ~2.1 times as long as wide, slightly paler than forewing, with similar marking pattern; one nygma present at middle. Veins pale brown. Forewing with trichosors present along wing margin between R and CuP; Rs with four main branches; MP with two main branches; two gradate crossveins present at middle. Hindwing with trichosors present along wing margin between R and CuA; Rs with three main branches.

Abdomen pale yellowish brown, pregenital segments dorsally brown. Ninth tergite in dorsal view with an arcuate anterior incision and a nearly V-shaped posterior incision, leaving a 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 obviously shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view with a pair of parallel prolongations which are truncate and serrate at tip, posteroventrally with a pair of subsemicircular and flattened projections, a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Ninth gonocoxite with anterior half broadly spoon-shaped and with posterior half slenderly elongate and curved posteroventrally; tenth gonocoxite slenderly elongate, much longer ninth gonocoxite, with incurved base and spinous tip which is curved outward, medially with a lobe connecting to ninth gonocoxite; gonarcus beam-shaped, laterally connecting to base of ninth gonocoxites. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined.

Holotype ♂, "HIKOSAN [33°01'N, 131°01'E], Kyushu, Aug. 3, 1934, S. Hiroyama/ Dilar hikosanus n.sp. (Type) W. NAKAHARA/Waro Nakahara Collection II/ Dilar hikosanus n.sp. W. NAKAHARA (Holotype)/NSMT-I-Nr No. 4302" (NSMT). 2♂, JAPAN: Kyushu, Hikosan, Buzen, 19.VII.1963, H. Kuroko (NIAES).

Distribution.

Japan (Kyushu).

Remarks.

See Remarks under Dilar japonicus McLachlan, 1883.