Synonym: Wilkara Swinhoe (type species nigerrima Swinhoe, Sumatra). The Japanese species of Hadennia and their Oriental relatives have been studied extensively by Owada (1979, 1987, 1992).
The male antennae are generally fasciculate, but a few species have a central node as described for Paracolax above. Some species have a hair pencil dorsally on the third segment of the labial palps, which are usually more strongly recurved over the head than in Paracolax and may extend to, or be embedded in the thorax in some species (Prout, 1932). The species have the flap along the underside of the forewing costa of the male as in Paracolax.
The wing facies is typically a series of contrasting dark brown to black and mauvish or purple bands, sometimes with additional finer fasciation; the forewing postmedial band can be dentate at its distal border. The forewing discal spot (and sometimes that of the hindwing) is typically pale yellow. These facies features define the genus.
The male abdomen has a framed corematous eighth segment as in Paracolax, the sternite sometimes with a single central corema, and the genitalia are also usually as in that genus. The valves are simple, rather tongue-like, and the process arising distally from the sacculus is usually short, apically rounded. The aedeagus vesica is usually only finely scobinate.
The female genitalia usually have the bursa immaculate or with weak spining in a central belt. There is a small scobinate signum usually in the basal half, but sometimes just distal to the centre.
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