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Thyrostipa Hampson
Type
species: sphaeriphora Moore,
India.
The
genus is monobasic. The size is medium, the ground colour grey. The wings have
angles at the centre of their distal margins. The fasciation is finely darker,
angled around the discal zone distal to it on the forewing, where the postmedial
and submarginal confine a darker triangle on the costa as in several other
genera (see p. 14). The reniform and orbicular are white, unusually close
together, with the orbicular much larger than the reniform.
In the
male abdomen the eighth tergite is more strongly sclerotised centrally, with a
pear-shaped lacuna within this area distally. The sternite has the interior
margin narrowly sclerotised, with broader bands on each side, but no corematous
structures are evident. The genitalia are simple, the valves narrow and slightly
spatulate. The aedeagus and vesica are relatively large, the latter elongate
with a few small diverticula, generally weakly scobinate but with no cornuti.
In the
female the terminal segments are small, the eighth segment forming a complete
ring, with the ostium anterior to it. The ductus leads into the long, pyriform
bursa at an obtuse angle. The bursa is finely scobinate throughout, but this
scobination is strengthened gradually into two umbonate signa at the apex.
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