SUBFAMILY HYPENINAE
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Acidon Hampson

Type species: paradoxa Hampson, Bhutan.

This genus was revised by Lödl (1998a, 1999b); see also comments in Holloway (2005: 29, 402, 416).

This genus contains a greater diversity of facies types than the two preceding ones, including some that resemble Hypena species. In others the forewing shape is more as in the preceding genera, often with a produced and falcate forewing apex. The postmedial of the forewing never has a strong discal projection, but is often angled or zigzag, sometimes transverse, sometimes oblique, varying from a medial to a very distal position. Often the area basal to it is darker than that distad. In a few species the antemedial is apparent and forms the distal boundary of a darker area. There is also usually a submarginal, punctate, with black and white as in Mecistoptera, or entire and just white. In some species (e.g. mediobrunnea Holloway) there is a white orbicular spot. The male antennae are also diverse in form, varying from ciliate though fasciculate to serrate.

The male abdomen has a framed corematous eighth segment. The genitalia are much as in Hiaspis, but the uncus is generally shorter, and the valves are generally broader. The basal saccular process is often present, but can be absent.

The female genitalia have the ductus and bursa more elongate than in Mecistoptera, with the ductus seminalis arising from the base of the latter, directed posteriorly. The bursa is generally rugose or scobinate, and may be corrugated; the scobination may be concentrated in a small signum.

Lödl (1998a) included eleven species and later (1999b) added one more. Four of these occur in Borneo and seven more are described as new below; two female specimens may represent further species.

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