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 Arctornis bilobuncus sp. n.  

 Arctornis bilobuncus (holotype)

16mm. The wings are somewhat diaphanous, with a sparse and irregular scattering of the broader scales in striae. There is a small black discal spot on the forewing. The frons is broadly pinkish rufous below the line of the antennae, with a white triangle notching this area ventrally, or with a more restricted area of white. The palps grade ochreous yellow towards the apex. The legs are not spotted. The male genitalia have the uncus broad, bilobed and darkly rugose, a unique feature in the genus. The pair of lateral processes of the aedeagus are well developed, the valves rectangular with the apical margin slightly concave and a long straight, slender harpe that extends just beyond the apex.

Holotype  SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 23, April, W. Melinau Gorge, 250m, 430558, FEG 4, limestone forest, BM lymantriid slide 1630.

Paratypes: 3 SABAH: Mt Kinabalu (Mesilau, 1500m; Park H.Q., 1620m, slide 1108; Kamborangoh, 2110m, slide 1111), vii-ix.1965, Cambridge Expedition to Mt Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway).

Geographical range. Borneo.

Habitat preference. The species is rare but recorded over a wide altitude range, 250-2110m.

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