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Arctornis dorsalineatus sp. n.  
Redoa sp. 3; Holloway, 1976: 43.

Arctornis dorsalineatus (holotype)

14-17mm. Externally this species resembles ferruginicosta but has the dorsal line of the abdomen narrowly rufous brown. The male genitalia have the uncus narrower, slightly bilobed. The valves and harpe are similar, but the latter is more robust and has a diagnostic double bulbosity over its distal, more scobinate half. The aedeagus has a single process as in ferruginicosta.

Holotype . BRUNEI, 15m, Telisai, sandy heath forest and Gymnostoma, 3.2.1979 (Lt. Col. M.G. Allen) BM lymantriid slide 2093.

Paratypes: 1 BRUNEI, 15m, Daerah Belait, swamp forest, 26 Feb 82 (Lt. Col. M.G. Allen); 14 SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977- 8 (J.D. Holloway et al.) Site 14 (2), February, Camp 2.5, Mulu, 1000m, 413461, lower montane forest, Site 20 (7, slide 1581), Mar.-Apr, W. Melinau Gorge, 150m, 422577, FEG 3, kerangas, Site 22 (4, slide 1637), as 20 but 421578, wet kerangas, Site 25 (1, slide 1636) April, G. Api, 900m, 427550, lower montane forest; 1 (slide 1105) SABAH, Mt. Kinabalu, ‘Power Station’, 1930m, vi - ix.1965, Cambridge Expedition to Mt Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway).

Geographical range. Borneo.

Habitat preference. The frequency and occurrence in heath forests resembles that of ferruginicosta, but the species is perhaps more abundant in the lower montane zone and has been recorded from as high as 1930m on G. Kinabalu.

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