TRIBE NYGMIINI n.
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Sundaroa Gen. n.

Type species: flaveofusca Swinhoe

Sundaroa is described to accommodate a number of species misplaced in Aroa and Euproctis. Indeed, all Oriental Aroa are probably misplaced (see Orgyiini and Parvaroa Gen.n). The African type species of Aroa, discalis Walker, lacks tymbals in the male abdomen, has the uncus divided into two simple, tongue-like valves, and has a curved aedeagus with a variably scobinate vesica.

The build is delicate, with rather deep, rounded forewings. Both wings tend to be brightly coloured in shades of yellow, orange, brown and black. All species have large black discal spot on the forewing. The venation is similar to most Nygmiini, and has M3 + CuA1 stalked in the hindwing. Sexual dimorphism varies from very slight to extreme.

The male abdomen lacks tymbals. The genitalia have several bizarre and diagnostic features that necessitate mounting them in a lateral position as for butterflies: the uncus is long to very long, with a pair of dorsal projections at its base; the valves are very small, narrow, rather digitate; the aedeagus is short, asymetrically Y-shaped, with spines at the apex of the larger distal arm; the base of the aedeagus is also bifid.

The female has unusually shaped ovipositor lobes with the dorsal angles distinctly produced. The pseudopapillae are well developed. The sterigma is strongly sclerotised but the ductus and bursa are small, flimsy, the latter with no signum.

The genus appears to be restricted to Sundaland and is most diverse in Borneo. As well as those species discussed below, it also includes S. mirma Swinhoe comb. n. (Sumatra). Many species are day-flying.

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