Dilar hornei McLachlan, 1869

Li, Di, Aspöck, Horst, Aspöck, Ulrike & Liu, Xingyue, 2019, A review of the pleasing lacewing genus Dilar Rambur (Neuroptera, Dilaridae) from Central Asia, Zootaxa 4671 (1), pp. 35-54 : 40-41

Dilar hornei McLachlan, 1869

( Figs 5 , 32–35 , 50 )

Dilar hornei McLachlan, 1869: 33 . Type locality: NW-India [exact locality unknown].

Diagnosis. This species is characterized by the forewing with numerous dark brown spots and spots around nygma darkened and large; the male tergum 9 with elongated and broad dorsoprocessus, narrowed at middle; the gonocoxite 9 distally with an acutely pointed apex; the gonocoxite 10 with a digitiform apex and a broad, hook-like, subdistal projection.

Description. Male. Forewing length 10.5 mm, hindwing length 8.5 mm.

Head brown, with yellow setose tubercles. Compound eyes blackish brown. Antennal socket yellowish brown. Antenna yellowish brown, scape slightly darker, pedicel with a yellow annular stripe distally, flagellum pectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly twice as long as corresponding flagellomere, distal six flagellomeres simple.

Prothorax yellowish brown, pronotum yellow brown, slightly darker at middle; mesothorax yellowish brown, mesonotum brown, slightly darker on lateral margins; metathorax yellowish brown, metanotum pale yellowish brown, slightly darker on lateral margins. Legs yellowish brown with yellow setae. Wings hyaline, slightly yellow. Forewing 2.3 times as long as wide, with numerous brown spots, arranged irregularly; spots around nygma darkened and large; veins pale yellow. Hindwing 2.2 times as long as wide, almost immaculate.

Abdomen yellowish brown. Tergum 9 in dorsal view with an arcuate anterior incision, a nearly U-shaped posterior incision, and an elongate and broad dorsoprocessus, leaving a pair of broad hemitergites, which are obtuse distally and densely haired, dorsoprocessus narrowed at middle, slightly concaved on posterior margin ( Fig. 32 ). Sternum 9 shorter than tergum 9, arcuately convex posteriad and bearing long setae in ventral view. Ectoproct in dorsal view subtrapezoidal, posterodorsally with a pair of short tubercle-shaped projections, posteroventrally with a pair of curved bifid unguiform projections (visible in dorsal view) ( Fig. 32 ) and paired short feebly sclerotized digitiform processus (visible in caudal view) ( Fig. 35 ). Gonocoxite 9 ( Fig. 33 ) in ventral view shorter than gonocoxite 10, distally with an acutely pointed apex. Gonocoxite 10 in ventral view incurved, apex digitiform and slightly inflated at tip, subdistal projection broad, hook-like, directed anteromedially. Gonocoxite 11 forming an arcuate sclerite, connecting to bases of gonocoxites 9 and 10. Hypandrium internum nearly trapezoidal.

Materials examined. Holotype ♂, N.W. [northwestern] India / McLachlan Coll. B.M. 1938-674 / Dilar hornei , M[c] L[achlan]. ( NHM) . Paratype 1♂, same data as holotype ( NHM) .

Distribution. India.

Remarks. This species appears to be closely related to D. caesarulus and D. kirgisus in having distinctly produced apex and subdistal projection of the male gonocoxite 10 ( Figs 27 , 33 , 37 ). However, in D. hornei the apex of male gonocoxite 10 is digitiform and slightly inflated at the tip, and the subdistal projection is broad and hook-like ( Fig. 33 ). In D. caesarulus and D. kirgisus the apex of male gonocoxite 10 is almost arcuate at tip, and the subdistal projection is narrower. It is noteworthy that one of the two paratypes of D. hornei has completely different male gonocoxites 10 from the holotype and the other paratype of this species ( Fig. 61 ). This paratype specimen is in actuality misidentified and should be D. vartianorum ( Fig. 16 ).

Figures

FIGURE 5. Dilar hornei McLachlan, holotype male, habitus. Northwestern India.

FIGURE 50. Dilar hornei McLachlan, holotype male, genital sclerites, ventral view (see habitus photo in Fig. 5).

FIGURES 32–35. Dilar hornei McLachlan, male holotype. 32. genitalia, dorsal view, arrow indicating dorsoprocessus; 33. genitalia, ventral view; 34. genitalia, lateral view; 35. ectoproct, caudal view. e: ectoproct; gx9: gonocoxite 9; gx10: gonocoxite 10; gx11: gonocoxite 11; hi: hypandrium internum. S7–9: sternum 7–9; T7–9: tergum 7–9. Northwestern India.

FIGURES 24–27. Dilar caesarulus H. Aspöck & U. Aspöck, holotype male. 24. Tergum 9, dorsal view, arrow indicating dorsoprocessus; 25. genitalia, lateral view; 26. ectoproct, dorsal view; 27. gonocoxites complex, ventral view. Afghanistan: 125 km SW Ghazni (after H. Aspöck & U. Aspöck 1967 and unpublished).

FIGURES 36–39. Dilar kirgisus H. Aspöck & U.Aspöck, male. 36. genitalia, dorsal view, arrow indicating dorsoprocessus; 37. genitalia, ventral view; 38. genitalia, lateral view; 39. ectoproct, caudal view. e: ectoproct; gx9: gonocoxite 9; gx10: gonocoxite 10; gx11: gonocoxite 11; hi: hypandrium internum. S7–9: sternum 7–9; T7–9: tergum 7–9. Turkmenia, Eroyulandus.

FIGURES 60–68. Dilar vartianorum H. Aspöck & U. Aspöck, genital sclerites, ventral view, showing intraspecific variations (see habitus photos in Figs 15–23 orderly).

FIGURES 15–23. Dilar vartianorum H.Aspöck & U.Aspöck, males, habitus. Fig. 15: holotype, Afghanistan: 25 km N Barikot; Fig. 16: Northwestern India; Fig. 17: India: Jammu and Kashmir State, Baramulla District, Gulmarg; Fig. 18: India: Jammu and Kashmir State, Baramulla District, Gulmarg; Fig. 19: India: Jammu and Kashmir State, Kishtwar (Jammu), Palmar-Sonder- Yourdu; Fig. 20: India: Jammu and Kashmir State, Kishtwar (Jammu), Palmar-Sonder-Yourdu; Fig. 21: India: Jammu and Kashmir State, Kishtwar (Jammu), Palmar-Sonder-Yourdu; Fig. 22: India: Jammu and Kashmir State, Kishtwar (Jammu) Palmar-Sonder-Yourdu; Fig. 23: India: Jammu and Kashmir State, Kishtwar (Jammu), Palmar-Sonder-Yourdu.