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Disparia Nagano

Disparia sundana Roepke  
Parafentonia sundana Roepke, 1944, Natuur. Maandbl. Maastricht. 34: 20
Disparia sundana Roepke; Kiriakoff 1968: 207.

Disparia sundana

The triangular dark basal area, tinged bluish, on the forewing, and the pale rufous yellow colour of the rest of the wing and the hindwing, distinguish this species.

Taxonomic notes. The distal margin of the forewing basal area is more extremely oblique than in Sumatran and Javan specimens, reaching to just beyond the centre of the dorsum rather than to just beyond one third. In the male genitalia the uncus is more robust and the gnathal processes larger, more produced and acute ventrally than in Sumatran males, which also lack the apical flap to the valve; the dorsal margin to the heavy transtilla is evenly curved rather than humped. Therefore a distinct subspecies may fly in Borneo, but it would be unwise to describe such a taxon on the basis of a single, possibly aberrant, male.

The species sundana is related to the Himalayan diluta Hampson and to variegata Wileman from Taiwan and Japan, both species having rather dull greyish-brown forewings with obscure markings. The forewing pattern of the Himalayan and S. Chinese obliquiplaga Moore is more akin to that of sundana but in obliquiplaga the male genitalia are very different: the uncus is slender, bifid; the gnathal processes are slender, tapering rather than axe-shaped; the valve costa bears two long, slender flaps; the aedeagus has two lateral processes.

The Burmese taxon diversipectinata Bryk, placed as a synonym of sundana by Kiriakoff (1968: 192), is probably a synonym of diluta Hampson.

Geographical range. Borneo, Sumatra, Java.

Habitat preference. The single Bornean specimen was taken at 1618 m in upper montane forest, Bukit Retak, Brunei. It is montane in Sumatra and Java.

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