Oroplema Gen. n.
Type species: dealbata Warren, New Guinea.
This is a more cohesive genus than the previous one, but has similar
facies and lacks vein M2 in the hindwing. The medial bands of the wings are
somewhat more irregular, usually only heavily shaded at the forewing dorsum. The
hindwing has the typical epiplemine tails, but the forewing margin is much more
regular than in Pterotosoma. The male antennae are narrowly unipectinate,
the pectinations very close together.
The male genitalia are superficially like those of Pterotosoma, but
lack the tegumen modification of that genus, having the thickening ribbons
extending for more or less the full length. The uncus is slender, tapering, with
an acute apex or apical hook. At each side of its base are weak, setose,
triangular flaps. The valve is simple, with a strong costa that extends basally
as an elongate transtilla to meet its opposite number centrally. Just interior
to the transtilla is a diagnostic setose lobe within the basal lacuna of the
valve. There is a field of very fine, dorsally directed hair-setae along the
ventral margin of the valve. The aedeagus is slender, the vesica having a single
The female genitalia are small, particularly the ductus and bursa. These
are flimsy, unsclerotised, the latter lacking a signum.
The genus is montane in the tropics but also represented at subtropical
latitudes in mainland Asia. One species has been reared from the
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