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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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