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Setothosea Gen. n.

Type species: asigna van Eecke.
The unique species in this genus has usually been placed in Thosea as, apart from its pale golden brown colour, the external appearance is very similar to species of that genus. However, it differs in features of both genitalia and larvae indicating that it is best excluded from Thosea, lacking the traits presumed to be apomorphic and used in the definition of that genus.

In the male genitalia the uncus has a ventral subapical spur, possibly plesiomorphous within the 'crescent signum' group. The furca arms are not flexed back into the abdomen and are more robust, and sinuous than in Thosea; they are conspicuously setose. The aedeagus terminates in a spine and the anellus is also coarsely scobinate in the zone near the attachment to the aedeagus.

The ductus bursae of the female is short, unspiralled except for one twist where it enters the bursa. The base of the ductus and the lamella postvaginalis are distinctively sclerotised, shaped and scobinate, the latter overlapping the ostium in a semicircular flap.

The larva, illustrated by Wood (1968) and in below, is not lozenge shaped but more elongate, deep sided as in members of the bisignate group. The lateral row of processes is complete, uniform, but the dorsolateral row has strong tubercles on T2, T3, Al, A5 and A8 or A9 (indeterminate from the illustration) and the rest vestigial or absent. This situation (or variation on the theme) is also seen in other genera of the 'crescent signum' group such as Setora but the pattern along the dorsum, described in the specific account, is distinctive.

Setothosea asigna in Peninsular Malaysia (P.A.C. Ooi)

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