8 and 9mm. Both this and the next species have a similar purplish grey-brown facies to that of C. nigrisigna Hampson (N.E. Himalaya), with the forewing markings typical of the genus. Both Bornean species lack a basal dark mark on the forewing costa, but all the species show variability in markings. The male genitalia provide diagnostic features. In this species the uncus is deep, setose and flanked by quadrate processes from the tegumen, whereas in nigrisigna the uncus is slender and the tegumen is normal. The valves in nigrisigna are long, slender, with large setose lobes arising basally from the costa; those in purpurisigna are shorter, broader, tapering, without costal lobes. The saccus is broad, rounded in nigrisigna, but narrow, acute in purpurisigna.
Holotype. SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 22, April, W. Melinau Gorge, 150m. 421578, wet kerangas, BM noctuid slide 19998.
Paratype. General data as holotype but Site 13, February, Camp 2, Mulu, 500m, 401464, mixed dipt. for.
Geographical range. Borneo.
Habitat preference. Both specimens are from lowland forest, one from heath forest and one from hill dipterocarp forest.
