11-13mm. The forewings are of typical Acidon shape but more uniform than in other species, a rich dark rufous brown, with a faint, slightly sinuous transverse fascia that consists of a slightly paler band bordered on each side by slightly darker ones. The medial zone basal to it is suffused more with black, and there is an irregular row of black submarginal marks. The hindwings are dark brown. The male antennae are serrate, the processes short and broad. The male abdomen has the sternite with the anterior margin of the frame concave, and the lateral parts of the frame are sinuous, convergent posteriorly. There are two coremata within the frame. The tergite has a slender central thickening that tapers away distad but gives rise to the splayed apodemes anteriorly. The genitalia have processes both in the central pleat of the valve and in the subbasal saccular position. The saccular one is short, triangular, apically acute. The central one is slender, more digitate, reaching well beyond the centre of the valves or corema. The juxta is ovate, with longitudinal ridges on each side that give it a ‘pinched in’ look. The apex of the aedeagus and the base of the vesica are generally scobinate, but there are no larger spines.
Holotype. BRUNEI: 30-60m, Labi, lowland forest and secondary veg., 12.4.81, (Lt. Col. M.G. Allen), BM noctuid slide 19646.
Paratypes: 1 SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 21, March, W. Melinau Gorge, 130m, 423576, alluvial / kerangas bank; 1 (slide 18179) SARAWAK as above but Site 25, April, G. Api, 900m, 427550, lower montane forest.
Geographical range. Borneo.
Habitat preference. The material is from both lowland and lower montane forest.
