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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).
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Diomea
triangulata
(holotype)
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Holotype . 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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