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Achrosis spurca Swinhoe comb. n.
Prionia spurca Swinhoe, 1902, Trans, ent. Soc. Lond., 1902: 608.

Achrosis spurca

This species is related to the next two, with similar features of facies and male genitalia: produced gnathus with dorsoventral flattening and apical serration; loss of furca except for a conical furca pocket; valve costa apically setose and slightly produced; aedeagus vesica with a narrow lobe with a dense cluster of spines and a broad one with more disperses spines. In spurca the speckled brown and grey area of the hindwing occupies half to two thirds of the dorsal part rather than about one quarter; fasciae on the strongly speckled forewing are obscure except at the costa where they are broad, strong.

Geographical range. Borneo, ?Java.

Habitat preference. The species is not common, noted mainly from lowland alluvial and dipterocarp forest, including that on limestone.

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