Genus Gyrtona Walker, 1863

Gyrtona Walker, 1863b, List Specimens lepid. Insects Colln Br. Mus., 27: 89. Type-species: Gyrtona proximalis Walker, 1863, by original designation.

Nigramma Walker, 1863b, List Specimens lepid. Insects Colln Br. Mus., 27: 77. Type-species: Nigramma quadratifera Walker, 1863, by monotypy.

Chuduca Walker, 1863a, J. Proc. Linn. Soc. (Zool.), 7: 164. Type-species: Chuduca pyraloides Walker, 1863, by monotypy.

Clina Walker, 1865a, List Specimens lepid. Insects Colln Br. Mus., 31: 257. Type-species: Clina lapidaria Walker, 1865, by monotypy.

Diagnosis. The genus is characterized by the elongate forewing and the hardly transparent basal half of the hindwing. In the male genitalia, the valva is divided into two almost equal by length which are not connected by a membranous webbing; a specialized harpe presents at the base of the valva.

Description. Head. Distance between compound eyes same as eye diameter. Frons dark-brown, convex. Labial palpus extending beyond frons, the second segment elongate, the outer side sometimes with transversal or longitudinal dark lines. Thorax. Tegulae blackish-brown, mixed with brown scales, sometimes mixed with grey scales. Patagia colored same as tegulae, about same length as half of mesothorax. Legs blackish-brown, with the inner side paler colored, segments ends grey. Wingshape and venation. Forewing always triangular and elongate, sometimes extremely long and narrow, costal margin almost paralleled to anal margin. Hindwing always wide, both apex and tornus rounded, costal and anal margin straight, outer margin arch-like. Forewing venation: R1 free; R3, R4 and R5 stalked and diverging from upper angle of cell, R5 diverging before basal one third of stalk; R3 and R4 separate after terminal one third of stalk; R3-5 and R2 anastomosing at a point, formed an areole before upper angle of cell. Hindwing venation: Rs and M1 diverging from upper angle of cell; M2 and M3 diverging from lower angle of cell and shortly stalked; CuA1 diverging from lower angle of cell (Fig. 5, G. lapidarioides Holloway, 1985) (followed Holloway, 1985). Wing-pattern. Forewing always yellowish-brown, with various dark lines and patches; hindwing simple, with basal half hardly transparent. Underside of forewing and hindwing yellowish-brown. Abdomen. Blackish-brown, sometimes ends of segments grey. Male genitalia. Uncus long, bended centrally, pointed apically. Valva divided into two arms of almost equal length, not connected by a membranous webbing: sacculus short, with differently shaped harpe basally. Saccus triangular. Aedeagus short. Female genitalia. Ovipositor short and wide, with thick hairs. Both apophyses posteriores and apophyses anteriores filiform. Appendix bursae absent. Corpus bursae round, signum as round or stellate scobinate zone.

Distribution. Oriental, Australian and Afrotropical regions.