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Ossonoba Walker

Type species: torpida Walker, India.

This is a monobasic genus that shows some similarities with Scoliopteryx in forewing facies and the downward curvature of the apical part of the forewing when at rest. The forewing postmedial is a pair of closely parallel and slightly sinuous pale lines in both genera, but the margin in Scoliopteryx is more strongly dentate and angled, concave between the apical and central angles. In both genera and the following two the male antennae are bipectinate. The male hind-tarsi have scale crests as in Scoliopteryx.

In the male abdomen, the eighth segment is unmodified. The displacement of the scaphium up the uncus is not pronounced, but it is strongly developed and apically notched. The valve is not strongly divided as in
Scoliopteryx but the corema is more evident. The juxta is finely spined and the apex of the saccus is excavate. The aedeagus is straight, slender, the vesica small, tubular, scobinate.

The female genitalia have the seventh segment unmodified, though both sclerites taper slightly. The ostium is situated well within the eighth segment, the apodemes of which are relatively short. The ductus bursae is very long and slender, with a slight central twist, and being more sclerotised towards its base. The corpus bursae is large, ovate, with a signum consisting of a sclerotised, thorn-like invagination on one side, surrounded by a more extensive area of scobination. Three less thorn-like signa of a similar type occur in the more corrugated bursa of
Scoliopteryx, and the ductus seminalis arises near the ostium in both genera.

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