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Stenopterygia Hampson

Type species: subcurva Walker, Sri Lanka.

This genus holds together rather weakly on a number of features shared between some, but not all the species.

In the male the basal trifine hair pencils are present; lateral rods are present on the eighth sternite. There are costal processes on the valve, bilaterally asymmetric, in the type species but not in others. The peniculus of the tegumen is expanded into an elongate lobe bearing numerous long scales (the type species, calida, khasiana). The corona is weak (calida, kebeae Bethune-Baker (New Guinea)) or lacking (type species, khasiana). The sacculus is broad, bifid in calida, khasiana and, with modifications, in kebeae, but is narrow, single, bilaterally asymmetric in subcurva. The aedeagus vesica has a single distal cornutus in subcurva, kebeae and calida. The Fijian S. nausoriensis Robinson, is close in morphology to kebeae.

The female genitalia of the type species have a broad, convolute, finely scobinate lamella antevaginalis. The ductus bursae is broad, long, sclerotised, also finely scobinate. The bursa is shorter than the ductus, scobinate and corrugate throughout, but with a short, band-like sector more strongly sclerotised. The ovipositor lobes are narrow, triangular. In calida the lamella antevaginalis is very small, square. The ductus is short, sclerotised and slightly scobinate, without a more strongly sclerotised band. In neither species is there an appendix bursae.

The general facies is brown, the forewings with a 'ligneous' pattern, the tornal zone having pattern elements that resemble those of Dipterygina Sugi.

The larva of the type species has been recorded in India (Bell, MS). The larva is typically trifine, with only primary setae, broadest and humped at A8. The head is orange-red, the body smooth (apart from primary setae) and mainly black. There is a lateral orange patch on T1 and extensive orange on A8 and the rear part of A10. Each setae is based on a white dot, and there is a liberal scattering of white dots on each segment. There is a lunulate, broken, orange, subspiracular band from Al to A8.

The larva lives on the underside of a leaf of the host-plant, its head turned round to one side when at rest. If disturbed, it falls to the ground. It eats the young leaves. Pupation is in the soil in a tough oval cocoon of white silk covered with earth particles.

The host-plant is Ochna (Ochnaceae).

Stenopterygia rufitincta
Hampson, described from a single male from Sandakan, Borneo, has quadrifine hindwing venation, no basal trifine hair pencil and atypical apodemes on the basal sternite. The genitalia are also more typical of some quadrifine noctuid groups (e.g. a multilobed, scobinate aedeagus). This species is therefore excluded from this treatment and will be reexamined when the quadrifine subfamilies are investigated.

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