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Griseothosea
Gen. n.
Type
species: cruda Walker
Species
are brought together in this genus primarily on grounds of forewing facies
characters. The forewings are grey with a black discal dot and three darker,
greenish brown, diffuse fasciae at right angles to the dorsum: the submarginal is
entire but with a slight zig-zag at the centre; the medial runs from the discal
dot to the dorsum; the antemedial is also entire though often more obscure or
bounding a darker basal zone.
The
antennae are variably bipectinate: to one third in cruda, kinabaluensis and
two undescribed Sulawesi species (Slide 627, 874); to three quarters in G.
mixta Snellen comb. n. (Java); very narrowly, tapering away evenly in G.
fasciata Moore
comb.n. (N.E Himalaya, China). The fore-tibia in most species has
a distal white patch.
The male genitalia mostly have a horse-shoe shaped juxta, the ends of
which support a group of spines and sometimes a slender, finely setose, tapering
process that interacts with a subcostal flap on the valve. The juxta is not
ornamented in fasciata and in mixta the apical parts are developed
into a pair of massive bifurcate processes. The valve in most species has a
subcostal flap, often associated with folding and sclerotisation in the valve
lamina just ventral to it, or it has such ornamentation of the lamina without a
flap (mixta); C. fasciata lacks both flap and folding but has the apex of
the aedeagus bifid.
The female genitalia of fasciata and mixta have the bursa
and ductus typical of the crescent-signum group, though the ductus in mixta is
relatively less spiralled; the vaginal lamella is finely setose, more intensely
so in mixta. The lamella is setose also in cruda but the
spiralling is reduced to a gentle twist and the bursa lacks a crescent signum
but has a subbasal band or patch of basally directed coarser scobination.
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