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Diomea triangulata sp. n.
12mm. The facies is of a similar type to that of the previous two species, but there is a white lining to the forewing costa that curves in towards the centre of the wing medially to define one side of an approximately triangular dark brown patch at the centre of the costa. The marginal area of the wing is obliquely marbled diffusely in pale and dark greyish brown distal to a zig-zag dark postmedial with a row of pale dots on its distal angles. The hindwing is similar to that of orbifera, but there is a postmedial similar to that of the forewing separating two medial dark fasciae from a paler, irregular submarginal one, the last somewhat further from the margin than in orbifera. These facies characters are very close to those of C. livida Hampson comb. n. (Himalaya) but this has a more irregular pale lining to the costa and a more typical submarginal on the forewing. The male genitalia have the saccular processes of the valves large, bilaterally asymmetric, the right one shorter like the foot of a ballet dancer, the left one like an ice-hockey stick. The male genitalia of livida are very similar, but the left process is straight, rod-like, and the right one is more robust, anvil-like. Similar bilateral asymmetry is also seen (Yoshimoto, 2001a) in the more distantly related species D. jankowskii Oberthür (Japan) and D. insulana Yoshimoto (Okinawa I., Taiwan).

Diomea triangulata

. BRUNEI: 450m, Ulu Temburong, rainforest, 24.4.81 (Lt. Col. M.G. Allen Allen) BM noctuid slide 18166.

Geographical range. Borneo, Sulawesi.

Habitat preference
. The only specimen is from lowland dipterocarp forest.

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