Specimens lepid. Insects Colln Br. Mus., 16: 194.
 1864, J.
Linn. Soc. (Zool.), 7: 82.
This and the next few species have very similar facies, with dark brown
triangles on the costa, a small one at one third and a large one centrally. An
oblique comma-like mark (probably the reniform) of a similar colour is
associated with one or other of these triangles, usually the central one. There
is also a biarcuate pale submarginal that, in some species, has a further dark
brown area between the anterior arc and the margin. In lagusalis and
the species immediately following, this marginal area is only slightly darker
than the ground of the wing. O. lagusalis can be distinguished from the next
species best by the male genitalia, but it tends to have a paler forewing ground
colour, and the smaller triangle is slightly narrower and more oblique. The male
genitalia have the valve costa straight, terminating in an acute apex. The
oblique pleat of the valve has a triangular flap from its dorsal side.
preference. A series was taken by A.R. Wallace in Sarawak and forms the
basis for the type material of both names. There is also a specimen from Bidi in
Sarawak and one collected by Waterstradt in the Kinabalu area. During the Mulu
survey two specimens were taken at 100m in alluvial forest near limestone cliffs
at the western end of the Melinau Gorge. One was taken in lowland forest at 170m
near the Danum Valley Field Centre in Sabah.
Bell (MS) reared a related species in India that he tentatively identified as lagusalis;
vouchers have been located and appear to be of a distinct species with facies
more as in costisignata
(see below). The larva is cylindrical, the prolegs on A3 and A4 are absent. The
head is yellow with black spots. The body is whitish green, whiter at segment
junctions, and with the setae arising from conspicuous black spots. The anal
segment is yellowish, with a marginal row of six black spots and two more
are small, thread like. All stages are active, looping, and wriggling and
falling to the ground if disturbed. Pupation is in the soil or under a leaf, in
a light silken cocoon with cemented particles.
plant is Derris (Leguminosae).
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