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Genusa Walker
Type species: bigutta Walker, India.
This genus, originally described in the Lymantriidae (Fletcher, 1979),
is undoubtedly a member of the Hypochrosini. The wings are rather rounded, a
dirty white, usually with diffuse mottled banding in grey that occurs in the
spaces between the veins. The base of the forewing is tinged yellow, sometimes
with a black spot: The forewing cell is very long, with R1 and R2 arising from
R5 within it, and R3-5 forming a trifid branching system distally. There is a
crossvein between Sc and R1. The hindwing has a humeral lobe, lacking a frenulum.
The male antennae are strongly bipectinate, those of the female more
narrowly so. The male abdomen is broadest centrally; the tympanal organs are
very small. The genitalia have a pocketed furca, a down-looped vinculum and
coremata associated with it that are typically hypochrosine. The furca is
symmetric. Socii are absent. The gnathus terminates in a cluster of small
spines. The valves have a rather distinctive zone of small, scale-like setae
from half way along the costa, extending round the valve apex and then broadly
down the ventral margin. The aedeagus is small, without ornamentation.
The female genitalia have the ovipositor lobes short, squarish, with a
dorsal eversible pouch between them and the eighth segment. This is a simple,
deep, weakly sclerotised ring with the ostium at its basal margin. The ductus is
very narrow, scobinate, as long as the spherical corpus bursae. The signum is
large, with an irregular, incomplete, ring-like distal portion in a circular
base.
As well as the two species described below, the genus includes the type
species, a species from Thailand and Burma (slide 13404; the name destituta
Walker may be applicable but the Cambodian type specimen has not been
examined), a species from N. Vietnam and Hainan (slide 13395) and a species from
Luzon (slide 13396). Distinction between the species is most reliably made from
the structure of the furca.
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