Walker, Sri Lanka.
Synonym: Amilaga Swinhoe (replacement name for Lusia Walker); Aphadrapsa Warren (type species ochracea Leech, China); Badiza Walker (type species ereboides Walker, Borneo); Lusia Walker (type species geometroides Walker, Sri Lanka), praeocc.; Murgisa Walker (type species orgyoides Walker, Borneo); Onevatha Walker (type species alsusalis Walker, Borneo).
The genus was treated by Owada (1987) for the Japanese fauna. The male antennae are various, typically bipectinate, often with a central angle or a slight to prominent node, this last tending to be more basal when it occurs. Other species have the antennae unipectinate, ciliate or fasciculate, and these types may also be noded. The labial palps of males are directed forwards, the apical segment reduced, though with an interior tuft of scales, and accompanied by scale tufts from the second segment. In females the palps are slender, upcurved, with a longer third segment of a more typical herminiine type. The male foreleg may also be modified, usually with hairs and elongated scales on the coxa, femur and tibia. The male has a costal flap centrally on the underside of the forewing in a few species, illustrated for ablualis by Owada in Inoue et al. (1982: plate 383, fig 2). The hindwing cell is very short.
The facies has a number of features that are seen throughout the genus. The forewing and hindwing have similar ground colour and, from the discal mark outwards, similar fasciation, usually an irregular to multiple, often punctate, postmedial that may be sinuous or slightly angled. The forewing reniform (a small orbicular stigma may also be present) and the discal lunule of the hindwing are a similar colour to the postmedial as a rule, white in some species, black in others. There is a punctate submarginal of the same colour, and this encloses a pale zone or more definite pale markings at the margin in the anterior half of the forewing; this zone usually does not reach the costa and is probably the most consistent generic feature in the facies, though something similar is seen in a few Bertula species (p. 46). The forewing often also has a weak antemedial fascia.
The male abdomen has an eighth segment of the framed, corematous type. The male genitalia have characteristic valves, robust, distally broad and spined, and often with a spur or other process from the central third of the costal margin. The aedeagus vesica is generally scobinate.
The female genitalia (Owada, 1987) have the eighth segment well sclerotised, and its apophyses are short. The ostium is flanked on each side by a laminate area that is developed into a pouch in some species. The ductus bursae is short, furrowed. The corpus bursae is finely scobinate, the scobination intensified on a small sclerite to form a signum. The ductus seminalis is narrow, uncoiled.
The genus is diverse in the Oriental tropics and subtropics, attenuating eastwards, with only the type species extending to Australia, New Caledonia and Vanuatu. Poole (1989) also listed one species from Sao Tome and three from Madagascar.
The larvae feed on dead leaves (Owada, 1987).
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