Diagnosis. 15-16mm. The submarginals are white, broken, typical of the genus, and the fasciation is fine, dark, dentate on a medium-grey ground. The ornamentation of the male foreleg has a brush of hair scales over the tarsal area more as in Simplicia circumscripta, however. The tibial sheath is large, and the tarsal segments are reduced to a slender spine, half the length of the sheath. There is a distinct bulge on the femur that supports a hair pencil. A similar feature is seen in three Japanese members of the Polypogon complex (p. 124). The discal mark of the forewing differs from that seen in punctilinea and purpuralis in being more reniform in shape, finely and darkly delineated, centred by ground colour. The discal mark of the hindwing is similar but narrower, and is joined by a small orbicular dot on the underside. The male abdomen has the eighth tergite with a central thickening and splayed apodemes more typical of the framed corematous condition.The valves are broader than in punctilinea but with a similar saccular process. The saccus is much broader. The anellar tube is unspined, but the juxta contains a triangular impression with spining at its apex. The aedeagus vesica is more densely scobinate than in punctilinea on one side. There is spining at the apex of the aedeagus ventrally, with a spined, rather ovate sclerite opposite.
Holotype. SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 16, March, Long Pala (Base), 70m, 324450, alluv. / second. for., BM noctuid slide 19639.
Paratypes: 1 (slide 20191; foreleg) general data as holotype but Site 23, April, W. Melinau Gorge, 250m, 430558, FEG 4, limestone forest; 1 BRUNEI: 30-60m, Labi, lowland forest and secondary veg., 12.4.81 (Lt. Col. M.G. Allen); 1 BRUNEI Exped 1979, 5 June, (Allen), Lamunin, 30m; 1 INDONESIA: Borneo, Kalimantan Tengah, Barito Ulu 2001, at Busang / Rekut River Junction, 0°38' S, 113°59' E, viii.2001 (G. Martin);
Geographical range. Borneo.
Habitat preference. All four specimens are from lowland forest, in some cases with areas of secondary forest.
