Miscellaneous Genera VI
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Oglasa lagusalis Walker
Oglasa lagusalis Walker, [1859]1858, List Specimens lepid. Insects Colln Br. Mus., 16: 194.
Dorsippa notabilis Walker, [1863] 1864, J. Linn. Soc. (Zool.), 7: 82.


Oglasa lagusalis

. 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.

Geographical range. Borneo.

Habitat 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.

Biology. 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 Hampson (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 centrally.

Hatchlings 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.

The host plant is
Derris (Leguminosae).

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