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Prismosticta
Butler
Type
species: fenestrata Butler.
This genus is similar to Andraca; the forewings are minutely falcate at
the apex, with a slight bulge on the margin just posterior to the
falcation. Postmedial and antemedial are double, the former angled basad
subcostally as in the previous two genera, with a diagnostic white
triangle distal to the angle of the outer element. There is a strong black
discal spot on the forewing.
In the male genitalia the uncus is entire or weakly bilobed; the gnathus
forms a complete band, heavily sclerotised distally. The valve is basally
narrowed and has processes from the centre of the ventral margin. The
eighth segment is not significantly modified.
The female genitalia (fenestrata) have the eighth segment as a complete
ring. The ductus bursae is long, slender, with a distal twisted section,
the twist reinforced by a longitudinal ribbon of sclerotisation. There is
a longitudinal signum in the bursa, consisting of an irregular band of
small spines that tapers away basad.
Sevastopulo (1939)
described
the fully grown larva of the type species (originally identified as
Andraca bipunctata). The colour varies from greenish yellow to darkish
brown marked with darker lines and paler stripes. The thorax and first
abdominal segment are expanded laterally into a triangular lobe. The
eighth abdominal segment bears a long, curved, fleshy horn, the end of
which can curl and uncurl. Most segments have a subdorsal wart on each
side that bears a black bristle. Pupation is in a small cocoon of brown
silk, spun on a twig or in a clump of leaves.
The type species is Himalayan, and the genus is completed by the Japanese
P. hyalinata Butler and the Sundanian species described below.
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