Decetia numicusarioides Holloway sp. n.
♂♂ 17, 19mm. This species is closely related to the type species of the genus, numicusaria Walker, but is less brown, more of a slaty grey. There is a related species in Sulawesi (slide 225), and D. dichromataria Walker from New Guinea and neighbouring areas is also in the group. Material from Sumatra (ZSM) may represent a further species. All have four spots in veins M2 and CuA2 submarginally in an arc that is concave distad: that on M1 is displaced basad.
In many specimens those on M1 and M2 are obscured within a larger black patch. The main differences are in the male genitalia, where the valve is narrow and appears deeply divided over the distal half through the presence of a long spine- like process arising from the valve costa. This process is strongly curved and extends almost to the valve apex: in numicusaria it is much shorter; there are differences in the valve and a larger, broader uncus in the Sulawesi species and dichromataria.
Holotype ♂
SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 23, April, W. Melinau Gorge, 250m. 430558, FEG 4limestone forest, BM uraniid slide 220.
Paratype
1 ♂ as holotype but Site 24, 270m; l ♂(abdomen damaged and mostly lost) Temburong, L.P. 298, 300metres, BRUNEI, 21 .ii. 1982 (T. W. Harman).
Geographical range
Borneo.
Habitat preference
All specimens were taken in lowland dipterocarp forest.
Genitalia:
