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Diduga
Moore
Type
species: costata Moore, Sri Lanka.
Synonym:
Androstigma Hampson (type species albicosta
Hampson, India).
Diduga
species are
all small, either with medium brown forewings that have darker fasciae and
stigmata, or uniform black brown with white or yellowish margins along the costa
and distally. The forewings have a complete set of veins arising from the cell,
only (R4, R5) stalked, the rest independent, R1 to R3 all extending to the
costal margin (Fig 7c, d). In the hindwing, Rs and M1 are stalked, M2 lost and
the rest independent. The male antennae vary from ciliate to bipectinate. There
are often various hair pencils and androconial tufts on the wings of males.
Fig 7c: Diduga
pectinifer Hampson |
Fig 7d: Diduga
trichophora Hampson |
The
male abdomen has the eighth tergite narrowed, with long, slender apodemes. The
intersegmental membrane between it and the genitalia has narrow but long lateral
hair pencils in many species. The valves have diverse structure but are usually
either simple, long, slender, tapering, or short with several distinct
processes, sometimes with bilateral asymmetry.
The
female genitalia are similarly variable, the ductus and bursa ranging
considerably in length.
The
genus extends from the Indian Subregion and Taiwan to the Philippines, Sulawesi,
Alor and Sumbawa, with an outlying white species, albida
Hampson, in New Guinea. The genus is particularly diverse in Borneo. The
type species is not a synonym of flavicostata
Snellen (Java, ?Alor) as indicated by Hampson (1900), but distinct.
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