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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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