The Saroba group of genera
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Tropidtamba Hampson

Type species: lepraota Hampson.

The only congener listed by Poole (1989) for the type species is transferred to Tamba Walker on p. 358, rendering Tropidtamba monobasic. The facies of the type species is similar to that of Tamba, but distinctive in that the forewing postmedial is not angled, whereas that of the hindwing is, the reverse holding in most Tamba. Also, the pale and dark areas are distributed in a manner that is almost the reverse of that seen in many Tamba, e.g. T. magniplaga Swinhoe. The male antennae are ciliate, and the forelegs are densely tufted with scales and a hair pencil.

The male abdomen has the eighth sternite unmodified, but the tergite has broad apodemes that are linked by a weak horseshoe-like sclerotisation. The genitalia have an uncus that is short, domed, and valves with a tongue-like distal portion and a series of more basal processes on the costa and sacculus. The costa projects basally across the diaphragma on each side anterior to a prominent furca on the juxta. The vinculum and saccus are much broader than in Tamba. The aedeagus vesica is broad, convolute. The valves generally resemble those of taxa in the Saroba group of genera as well as those of Tamba species, though the latter have much more elaborate modification of the eighth segment as described below.

The female genitalia have the ostium set in a complex pocket at the anterior of the eighth segment and within the seventh; it is surrounded by a serrate, semicircular, ventral lip and a pair of prongs dorsal to it, and the pouch is generally rugose. The ductus is moderate, sclerotised, slightly tapering to join the rather elongate bursa by a rather flocculent basal zone. The rest of the bursa is unadorned.

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