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Arctornis tricorniger sp. n.  
Redoa sp. 7; Holloway: 1976: 44.

Arctornis tricorniger (paratype)

17, 19mm. The facies is much as in the naphtha group with broad irregularities in the satiny reflection from the wings. The frons and palps are extensively rufous-yellow, the latter darker apically. The foretibia has a basal patch of the same colour, and the forewing costa is also slightly tinged yellow. The male genitalia are not of the naphtha type, having a needle-like distal part of the uncus arising from a triangular base. The valves are also diagnostically adorned with two large spines dorsally on the sacculus and a smaller one directed ventrally in a subapical position.

Holotype . SABAH, Mt. Kinabalu, Park H.Q., 1620m. vii-ix.1965, Cambridge Expedition to Mt Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway), BM lymantrid slide 1110.

Paratype . SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 15, February, Camp 2.5, Mulu, 1000m, 413461, lower montane forest, BM lymantriid slide 1582.

Geographical range. Borneo.

Habitat preference. The species is montane.

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