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Andraca
Walker
Type species:
bipunctata Walker.
The venation and facies is much as in the previous genus, though the
forewings are only weakly falcate, if at all. The colour is usually rich
brown, with markings similar to those of Mustilia, except the forewing
postmedial is not so strongly linked to the apex.
In
the male genitalia the uncus is weakly bilobed at the apex or entire; the
gnathus is completely divided into two curved, tapering processes. The
valves are triangular with small lobes one quarter from the apex. The
eighth segment is not strongly modified, only somewhat more sclerotised
than the rest.
The female genitalia (bipunctata) have a deep eighth segment, from which
the ventral margin of the ostium extends posteriorly in a broad bilobed
plate. The ductus is sclerotised distal to this to roughly its mid-point,
tapering to half its width; the distal half is unsclerotised, with slight
torsion. The bursa lacks a signum.
Sevastopulo (1946) described the fully grown larva of the type species.
The body has the thoracic segments tapered anteriorly and it is pubescent.
The ground colour is black, striped longitudinally with white. The eighth
segment is humped but has no horn. The larvae are gregarious and can be
heavily parasitised. The resting posture is as described in family
Bombycidae.
Pupation is in a thin cocoon of brown silk spun among leaves.
There are two Himalayan species and the Sundanian apodecta, described
below.
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