MORPHOLOGY
The descriptions below are on the genus level. For difference between the species we recommend to look at the pictures or look up the original species description.
External characteristics
Forewing length (mm): 14-25.
General morphology:
Antennae about as long as half of length of forewing, club slender, apiculus obtuse, finely pointed, 11 to 14 segments. Forewing broad, termen nicely curved, hind margin longer than termen; veins R1 and R2 almost touching, vein M3 much nearer to vein CuA1 than to vein M1. Hindwing termen evenly rounded, inner margin about as long as costa.
Wing coloration:
Upper side: Unmarked blackish brown above and below (below a bit paler), or, usually, forewing with a wide orange area that covers one third to more than half of the wing. Much seasonal and geographic variation.
Secondary sexual characters:
Male with long thin hair pencil from base of costa on upper side of hindwing, engaged with a groove, containing specialized scales below the radius vein on the underside of the forewing.
Species
Five species, extending from India through continental SE. Asia to the Philippines, Borneo and Bali.