FAMILY BOMBYCIDAE
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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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