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Arctornis marginalis Walker comb. n
Redoa marginalis Walker, 1862, J. Linn. Soc. (Zool.), 6:128.

Arctornis marginalis

This is one of a small number of species where areas of the forewing membrane are tinged greenish. In marginalis this occurs in the centre of the wing over CuA and its branches and M1 to M3, and is strongest on these veins. The apex of the forewing costa is tinged blackish, and there are blackish triangles in the spaces of the distal margins of both wings.

Taxonomic note. A. listrophora Collenette comb. n. (Sulawesi) has similar facies but distinct genitalia: the valve apex lacks a subsidiary lobe, and the harpe is straight, apically spatulate, with a serrate margin. It is slightly larger. There is a further undescribed species from Sulawesi (slide 780) in the same group.

Geographical range. Borneo, Sumatra.

Habitat preference. The species is frequent in a variety of lowland forest types, with one specimen taken at 1000m on G. Mulu.

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