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Lassaba Moore Gen. rev.

Type species: contaminata Moore, N.E. Himalaya.

This genus is revived to contain several whitish Oriental species with grey and vinous suffusion and rather characteristic, regularly dentate postmedial fasciae that run more or less parallel to the wing margins: that of the forewing lacks the typically boarmiine subcostal angle.

The male forewing lacks a fovea, and the antennae are strongly bipectinate to about three quarters. There is a setal comb on abdominal sternite 3.

The male genitalia have the ventral margin of the valve costa lined with slender, spine-like setae. The saccular process is ovate to acute, and bears shorter, stouter setal spines. In the Sunadanian species the intervening lamina is sclerotised to about two-thirds and usually has a distal ruckle or (the Javan L. indentata Warren comb. n.) a central pleat or flange. This sclerotisation is more basally restricted in the type species. The aedeagus vesica usually has a few short, coarse spines at its junction with the aedeagus, and is generally finely scobinate.

In the female (L. vinacea Prout examined), the ovipositor lobes are narrow, acute. The ostium is set within a wide pouch on segment 7. The ductus is very short, the neck of the bursa long, broad, basally scobinate and distally expanding slightly into a bulb that has a small, subapical, bicornute signum. This signum type is consistent within the genus.

Apart from the species mentioned above and in the description below, the genus probably also should embrace the Indian L. albidaria Walker comb. n. and L. parvalbidaria Inoue comb. n. from Taiwan. Dr D. Stüning is examining the placement of other similar taxa currently combined with Medasina.

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