Orgyiini

This is the second tribe recognised by Ferguson (1978), and is characterised most reliably by the presence of prominent dorsal brushes on abdominal segments 1-4, and usually a longer, slender one on A8. There are also usually lateral hair pencils directed forwards on each side of the head.

In the adult an areole is usually present in the forewing venation. The forewing facies is usually cryptic, with a strong reniform stigma in the discocellular position. This is entire, complex, slightly flexed, and usually more oblique than the V-mark in Lymantriini. There is no orbicular stigma.

The male genitalia sometimes have structures that may represent the gnathus. The uncus is variable in development. The valves are usually divided in some manner, sometimes with a costal lobe or arm, sometimes more equally divided, sometimes just apically bifid.

In the female genitalia, the signum is usually of the bicornute type. Calliteara butler is exceptional in having a scobinate band.

The tribe includes the diverse complex of taxa that has, in the past, been placed in Dasychira Hübner. This name, as indicated by Ferguson (1978), should be restricted to a group of N. American taxa that can be defined on several features of the male genitalia: a tongue-like uncus; a short, broad costal lobe to the valve; a globular and generally scobinate aedeagus vesica. The search for more satisfactory generic placements for the Old World taxa is still in progress. Riotte (1979) made a start with some of the Indo-Australian taxa, followed by Holloway (1982a, b). The African members of the complex have been reviewed in a series of papers by Dall’Asta (1981a, b, 1982, 1983). An attempt is made here to place many of the remaining Indo-Australian taxa.

Teia Walker, redefined by Riotte (1979) on the helmet-like uncus and gnathus, is probably more restricted to the Australasian tropics than Riotte considered, because most of the non-Australasian species he transferred to the genus are best placed elsewhere (see below). The New Caledonian taxon sarramea Holloway should formally be transferred to Teia, comb. n. as indicated by Holloway (1979: 364).

The genus Psalis Hübner, with African and Indo-Australian species with grass-feeding larvae and facies typical of this habit, have male genitalia close to those of the Olene Hübner and Teia group. Aroa cometaris Butler from the Bismarcks and Solomons is another member of this group, but does not fall readily into any of the genera treated below.

Female aptery occurs in a number of lineages and so cannot be taken to be definitive for Orgyia Ochsenheimer, in the region, though valid in N. America (Ferguson, 1978).