16, 17mm. 13-17mm. This species is similar in size and colouring to I. fulvipicta Butler (India, Sri Lanka, Andamans, Thailand (Kononenko & Pinratana, 2005)), mostly black fasciation on a dark grey ground, but has the reniform stigma obscure, lunulated, rather than a black chevron in a yellow patch. The postmedials on all wings have an outward projection centrally in substigmata (generally irregular in fulvipicta). On the underside the ground is more uniform, less irrorated with white in substigmata, and the forewing has the stigmata much larger, particularly the reniform, and more clearly defined. The male abdomen has the eighth tergite slightly longer and narrower than in fulvipicta; it is also more constricted near the splayed apodemes, making these appear larger. The genitalia are very similar to those of fulvipicta, except the saccular process of the valve is somewhat broader.
Holotype. SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 14, February, Camp 2.5, Mulu, 1000m. 413461, lower montane forest, BM noctuid slide 19512.
Paratypes: 1 (slide 19669) as holotype; 1 as holotype but Site 15; 1 general data as holotype but Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for.; 1 general data as holotype but Site 20 Mar.-Apr., W. Melinau Gorge, 150m. 422577 FEG 3, kerangas.
Geographical range. Borneo, Sumatra (HS / K).
Habitat preference. The species is rare, found in lowland and lower montane forest.
