Diagnosis. The male has a very extensive hair pencil structure under the forewing costa. Females have the fasciation generally clearer, when it can be seen to consist of dark lunules, often associated with paler ones. In both sexes the three dark lunules of the submarginal posterior to the most costal one are emphasised, particularly on the paler, finely brindled underside.
Taxonomic note. The synonymy of actorisalis, based on a male, and gnetusalis, based on a female, was established by Swinhoe (1900), who placed the species under Pseudaglossa Grote, now a synonym of Idia. He later redescribed another Bornean male as madida despite having a similar facies and, on the underside, costal hair pencils as the holotype of actorisalis. The holotype female of apidanusalis Walker (N. India) has very similar facies to the Bornean material, but the synonymy must remain tentative until Indian males are available. Poole (1989), largely reflecting the BMNH curation and indexing at that date, placed gnetusalis in Idia, actorisalis in Hydrillodes (though this taxon is curated under Bleptina in BMNH), apidanusalis in Alelimma and madida in Bertula. The structure on the underside of the male forewing and the presence of a faintly paler discal spot are suggestive of a relationship to Hadennia Moore (p. 90), but genital features do not support this or any of the current placements for the taxa brought into synonymy. The male abdomen (holotype of madida) has a framed corematous eighth segment. The valves of the genitalia are tongue-like, with a broad, rounded saccular process. There is no spherical structure between the valve bases, but there is a distinctive bifid juxta. The aedeagus vesica has two spined diverticula (not everted in the figure). The female has an unusually broad, funnel-like, scobinate antrum to the ductus bursae that tapers into the complex, partially corrugate (a lateral bulge) basal part of the corpus bursae; the bursa tapers away, tongue-like, from the base, and is generally rugose.
Geographical range. Borneo, N. India, S. Burma.
Habitat preference. The holotypes of the two Walker names were taken by A.R. Wallace in Sarawak, probably in the lowlands, and the holotype of madida is from the town of Kuching at sea-level, and therefore possibly from a disturbed and cultivated biotope.
