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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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