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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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