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Orvasca vespertilionis Holloway comb. n. 
Euproctis vespertilionis Holloway, 1976: 48.
Euproctis flavocinerea van Eecke sensu Schintlmeister, 1994: 119.

Orvasca vespertilionis (holotype)

The ground colour is pale yellow, the forewing lightly irrorated with blackish scales except at the margin, and the hindwing entirely dark grey except for a yellow border bounded diffusely with the grey. On the underside, both wings are basally grey, with a broad yellow border.

Taxonomic note. The male genitalia have the generic features, though the saccular flap is short, broad, with a central acute process. The valves have two spurs at the ventral margin. Schintlmeister (1994) referred material with similar genitalia (but with the outer valve spur distinctly larger) to flavocinerea van Eecke. The facies is similar, though the Sumatran material illustrated appears worn or faded.

The true identity of flavocinerea (Sumatra) is somewhat different. It is a pale fawnish species with male genitalia (Fig 97) very different from vespertilionis but nevertheless also having Orvasca features, so it is transferred to the genus, comb. n. The male genitalia have an uncus and gnathus structure typical of Orvasca, though the latter is only lightly rugose. The valves are divergently bifid. The flap between the valve bases consists of two widely separated spines.

Geographical range. Borneo, ?Sumatra.

Habitat preference. The holotype of vespertilionis was taken in the same locality as that of rufalba. No further material has been seen.

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