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Arctornis riguata Snellen comb. n.
Leucoma riguata Snellen, 1895, Dt. ent. Z. iris 8:138.

Arctornis riguata

The species is moderately large, with irregularly oriented broad scales on the forewing giving a mottled satiny effect. The discal spot is very weak, but there are diagnostically deep faint grey triangles in the spaces at the distal margin of the forewing. The hindwing fringes are also grey. The frons has a broad brown triangle as in poecilonipha and similar leg spotting, but the palps are dark brown throughout except ventrally where they are narrowly white. The valves are diagnostic, the distal to costal margin expanded and slightly setose, particularly at the costal angle. The harpe is downflexed at two thirds, broadening slightly beyond that point.

Geographical range. Sundaland.

Habitat preference. This is an uncommon species of lowland and lower montane forest, taken singly in dipterocarp forest in the Ulu Temburong and in kerangas forest on a river terrace west of the Melinau Gorge. The remaining four specimens were taken in forest on the limestone G. Api near the latter locality: two in dipterocarp forest at about 250m and two in lower montane forest at 900m.

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