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Prochasma Warren
Type species: mimica Warren, N.E. Himalaya.
This genus consists of several small species with pale yellow or whitish
wings that are heavily marked in dark brown such that the medial zone is dark,
bounded by dentate fasciae that are themselves bounded by a narrow band of the
pale ground colour. The male antennae are bipectinate. There is no forewing
fovea. The male third sternite lacks a setal comb but has a pair of obliquely
transverse patches of setal scars in a similar position, analogous to the
condition in many Geometrinae. D. Stüning (in litt.) has noted a brush
of metallic, spatulate scales posteriorly on the thorax as another generic
feature.
In the male genitalia there is a strong saccus, the valves are
parallelogram- shaped with a slight spur at the ventral obtuse angle and a
moderate cucullus. The aedeagus vesica contains a single massive cornutus.
The female genitalia have a short, unsclerotised ductus, a neck to the
bursa three times as long, asymmetrically sclerotised over the basal two thirds,
and a pyriform distal part. There is no signum.
The genus is purely Oriental.
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