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Plusiodonta calcaurea sp. n. 
, 15-18mm. This is a slightly larger species than coelonota, distinguished by the more extensive reflective golden areas on the forewing; these do not show significant sexual dimorphism in their extent. Particular features relative to coelonota are much broader blocks near the tornus and subbasally on the costa. In the male genitalia, the distal process of the valves appressed to the apex is singular, more digitate, straight, and the interior saccular process is larger and more robust than in coelonota. The aedeagus is very much larger and has a thorn-like spine at the apex. The vesica is also larger with a longer distal diverticulum that is much more coarsely spined over its apex. In the female, the eighth segment, ductus and bursa are all more elongate, the ductus narrower and the bursa more pyriform and therefore distinctly broader.

Plusiodonta calcaurea

Holotype. SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D.Holloway et al.), Site 27, April, G. Api, 1500m. Pandanus Camp, 429541, scrub, Pandanus, BM noctuid slide 18094.

Paratypes: 2 as holotype; 1 as holotype but Site 26, April, G. Api Pinnacles, 1200m. 428545, open scrub; 1 as holotype, but Site 25, April, G. Api, 900m. 427550, lower montane forest; 1 as holotype but Site 18, March, W. Melinau Gorge, 100m. 128563, alluvial forest & riverside veg.; 1 (slide 18096) SABAH: Mt Kinabalu, 5000ft., 4.5.1973 (K.M. Guichard).

Taxonomic note. The concept of coelonota here is based on a study of type material two of its synonyms as listed by Poole (1989) and Nielsen et al. (1996): chalsytoides Guenée and conducens Walker. However, coelonota is associated erroneously with Oraesia emarginata Fabricius (as a junior synonym) in the BMNH collection and card index, and was not noted as a senior synonym of chalsytoides by Nye (1975).

Geographical range. Borneo, Peninsular Malaysia.

Habitat preference. Most material is from montane habitats and on or near limestone.

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