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Arctornis isabella Toxopeus comb. n. 
Redoa isabella Toxopeus, 1948, Treubia, 19: 455.

Arctornis isabella

This is a large, slightly yellowish white species. The fringes of the wings and the forewing costa are tinged slightly dull brown. There is no discal spot. The frons has a black bar between the antennae and a pair of black patches immediately below it. The tips of the palps are black and there are black spots on the legs. The male genitalia are distinctive as illustrated.

Geographical range. Borneo, Sumatra (Schintlmeister, 1994).

Habitat preference. Though commonest in a wide range of lowland forest types, including heath forest, coastal forest and forest on limestone, the species has also been taken singly at 900m in lower montane forest on G. Api, at 1000m on G. Mulu and at 1670m in upper montane forest on Bukit Pagon.

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