16-18mm. This is a relatively large species with blackish forewings, variegated paler. The postmedial is transverse, distinctly triarcuate, similar to that in jugalis, but is distinguished by a pale, slightly bluish fascia with fainter ones parallel to it immediately distad and a much more uniformly black area basal to it apart from an obscure, paler, transverse antemedial. The apical lens is obscure but elongate, with its posterior border having a small falcate dentation directed distally from its centre. There is a slightly paler, brownish, rippled patch at the tornus. The male genitalia lack any distinctive features such as valve processes and are very similar to those of jugalis, except the distal part of the ventral margin of the valve is more convex, rendering the valve broader at that point.
Holotype. SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 13, February, Camp 2, Mulu, 500m, 401464, mixed dipt. for., BM noctuid slide 19596.
Paratypes: 2 as holotype; 1 general data as holotype but Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for.; 1 NORD BORNEO: Mont Kina Balu, 5-8.1903 (John Waterstradt).
Taxonomic note. The name ochradelpha is from an A.E. Prout manuscript and the BMNH curation. It was published as a nomen nudum by Lödl (1999e).
Geographical range. Borneo, Sumatra (Lödl, 1999e).
Habitat preference. Apart from one specimen without altitude data from G. Kinabalu, all material is from hill dipterocarp forest on G. Mulu at 150m and 500m. Seven additional specimens from 500m were not retained, nor were three from 150m in wet heath forest on a river terrace west of the Melinau Gorge.
