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Sysstema Warren
Type species: semicirculata Moore, N.E. Himalaya, Burma.
Species in this genus are externally similar to Prochasma, particularly
in size and facies, being suffused and marked in dark brown on a pale dull
yellow ground. The male antennae are strongly bipectinate, and there is no
fovea.
There are diagnostic features in the male abdomen. The seventh sternite
gives rise to a pair of processes laterally: weak, extremely lateral, apically
setose in the type species; weaker laterally but with an additional pair of two
overlapping disc-like structures (Fig 576) in the Burmese S. pauxilla Prout
and the Sundanian sister-species, described below. There is no setal comb on the
third sternite. The genitalia have the uncus short, blunt. The valves are
apically tapering, with the costa terminating in a massive setose lobe half way
along their dorsal margin. The vinculum is broad, rather square. The aedeagus
vesica has a row of peg-like cornuti in the type species but not in pauxilla and
its Sundanian relative. These latter have the gnathus strongly sclerotised,
broadly bilobed, and a prominent furca.
The female genitalia have extensile ovipositor lobes and apodemes. The
ductus is short, weakly sclerotised, the neck of the bursa being long, slender,
and the distal bulb immaculate or sparsely scobinate. The Bornean species has
the ostium in a transversely rectangular pouch.
The genus is restricted to the Oriental mainland apart from the species
below.
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