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Arctornis ferruginicosta sp. n.  

Arctornis ferruginicosta (holotype)

14-16mm. This and the next species are superficially similar in the broad, rusty brown delineation of the forewing costa on both surfaces that is much more extensive than in any other species, including corrugata: it also has a grey central streak. This species has the abdomen entirely white, without a dorsal rusty brown line. Both species have pale rufous fringes and a black discal dot to the forewing. The palps and frontal bar are also bright rufous. The legs are not spotted, though they may be tinged pale rufous in places, such as the ‘elbow’ and tarsi. Both species have a broad uncus, slightly constricted subapically as in malleuncus. In ferruginicosta this is broad, resembling the tab on a jigsaw puzzle piece. The valve is elongate-oval, the harpe a bit longer, slender, slightly sinuous, expanding evenly to an apical club with increased scobination. The aedeagus has a single process apically rather than the usual pair.

Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for., BM lymantriid slide 1592.

Paratypes: 1 as holotype; 14 general data as holotype but Site 12 (1), February, FEG 2, Mulu, 200m, 386469, Site 13 (2, slides 1580, 1594), February, Camp 2, Mulu, 500m, 401464, Site 14 (2, slide 1613), February, Camp 2.5, Mulu, 1000m, 413461, lower montane forest, Site 20 (5) Mar.-Apr., W. Melinau Gorge, 150m, 422577, FEG 3, kerangas, and Site 22 (4, slide 1595) April, W. Melinau Gorge, 150m, 421578, wet kerangas; 1 BRUNEI, 15m, Daerah Belait, Badas, swamp forest, 26 Feb ‘82 (Lt. Col. M.G. Allen).

Geographical range. Borneo.

Habitat preference. This is a species primarily of lowland forest, particularly frequent in heath forest, but extends up to the lower montane zone at 1000m.

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