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Thalatha Walker

Type species: sinens Walker.

This genus has been applied to a number of Indo-Australian tropical species but is probably best restricted to the type species and perhaps the Japanese T. japonica Sugi. Holloway (1979: 422) discussed several of the Australasian taxa with reference to Molvena Walker. The taxa dinawa Bethune-Baker (New Guinea), ekeikei Bethune-Baker (New Guinea), kebeae Bethune-Baker (New Guinea), psorallina Lower (Queensland) and an undescribed species from Seram form a natural group distinct from Thalatha having, in the male genitalia, very broad valves with a strong sacculus and harpe, extensive long setae externally on the valve, a strong, horseshoe- shaped juxta and a small, globular aedeagus vesica with a row of moderate slender cornuti. Two further species are separated in a new genus below.

All Thalatha in the old sense have convergent apodemes on the basal sternite of the abdomen and lateral rods to sternite 8. In T. sinens there is no corema basally on male sternite 8. The male valve has a strong harpe set on a base beyond the centre of the valve somewhat distinct from the rest of the sacculus. The harpe extends almost to the apex of the valve. The sacculus has a row of long bristles in the centre of the basal half of its dorsal margin. The aedeagus vesica is long, curved, tapering from a sharp, finely scobinate basal expansion, with a zone of coarser scobination at the distal end of the taper. In the female genitalia the bursa is pyriform on a slender ductus that is deeply notched and finely setose at the ostium; lateral to the ostium are broad patches of longer setae with heavily sclerotised bases.

The forewing facies of sinens has diagnostic features as noted below.

The larva is described below. Both this and the next genus have, in common with Craniophora, Oleaceae as recorded host-plants.

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