Dilar pallidus 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 : 145-146

Dilar pallidus Nakahara, 1955 Figs 5, 23

Dilar pallidus Nakahara, 1955b: 140. Type locality: China (Taiwan: Tattaka).

Diagnosis.

This species is characterized by the forewings with no obvious markings, and the male ectoproct in dorsal view with a subrectangular projection terminating in three sharply pointed processes of about equal length.

Description.

Male. Body length 3.5 mm; forewing length 10.5 mm, hindwing length 8.5 mm.

Head yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 24 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, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings hyaline, slightly yellowish brown. Forewing ~2.3 times as long as wide, with numerous very indistinct markings, and with a yellowish brown spot on 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; 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. Ectoproct in dorsal view with a subrectangular projection which terminating in three sharply pointed processes of about equal length, posteroventrally with a pair of large, bifid, unguiform projections and a subrectangular, feebly sclerotized projection. Ninth gonocoxite with anterior half slightly inflated and with posterior half slenderly elongate and strongly incurved; tenth gonocoxite slenderly elongate, with incurved base and spinous tip, submedially with a lobe connecting to ninth gonocoxite; gonarcus beam-shaped, laterally connecting to base of ninth gonocoxites. Hypandrium internum unknown.

Female. Unknown.

Material examined.

Holotype ♂, "Formosa, T. Kano/ Dilar pallidus n.sp. (Type) W. NAKAHARA/pallidus n. sp./Waro Nakahara Collection II/NSMT-I-Nr No. 4301/Type of Dilar pallidus ?" (NSMT).

Distribution.

China (Taiwan).

Remarks.

This species is known only from the holotype male, whose genitalia have been unfortunately lost. The present redescription of the male genitalia is based on the original illustration from Nakahara (1955b). Considering the wing marking patterns, Dilar pallidus has very pale wings without distinct dark markings, while the other Taiwanese species of Dilar have much darker markings on forewings. Considering the male genitalia, it is obvious that Dilar pallidus is closely related to Dilar taiwanensis by having similar male gonocoxite complexes 9, 10, 11. However, in Dilar pallidus the male ectoproct differs in some details, e.g. the presence of a rectangular dorsomedian projection, and the presence of a pair of posteroventral lobes each with two widely separated claw-like projections, from Dilar taiwanensis . Nevertheless, the specific identity of Dilar pallidus needs further clarification when more materials will be available.