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Thoyowpongia Gen. n.

Type species: nigrodiscus sp. n.

The antennae are filiform, finely and evenly ciliate. Forewing veins R1 and R2 have a common stalk, arising independently from Rs at the cell: R1 anastomoses with Sc over a short distance after diverging from R2. There is no fovea. The forewing margin is angled at M3, that of the hindwing generally crenulate. The facies of the wings consists of a dense mottling and striation of blackish grey on a pale yellow ground, with some rufous tints, especially just posterior to the discai spots. These are large, black, that of the hindwing twice the area of that of the forewing, its scales somewhat raised towards the centre. On the underside the discal spots are inconspicuous. The female (a single specimen from Peninsular Malaysia) has the wing margins more weakly angled.

The abdomen has a setal comb on sternite 3 and a tuft of black scales associated with the genitalia beyond a pale terminal segment. The genitalia have a number of distinctive features. Both uncus and gnathus are broadly bifid. The valves lack a cucullus, but the costa gives rise to a large triangular process, the distal side concave, the angles at each end of this side acute, the ventral one terminating in a spine. The aedeagus is short, stout, with a small, unornamented vesica.

The female genitalia have a spherical bursa with a tubular neck that is basally sclerotised, scobinate. There is no signum. The ductus is short, rather funnel-like. The lamella antevaginalis is rectangular, longitudinally crinkled, and the lamella postvaginalis is semicircular.

The genus is dedicated to the memory of the late Dr Tho Yow Pong, a Malaysian entomologist who worked assiduously for the conservation of his native forests and was a good friend and colleague of the author.

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