Type species: petavius Stoll, Ambon, S. Moluccas.
Synonyms: Cleis Guérin-Méneville (type species posticalis Guérin-Méneville,
Bismarck Is.); Datanga Moore (type species minor Moore, Burma, = sakuni
Stoll); Petavia Horsfield (type species sakuni Horsfield,
As indicated in the diagnosis of Tetragonus, the best definitive
features for the genera are in the male abdomen. In Callidula the
hair-pencils are between the eighth sternite and the genitalia, long, narrowly
based in one or two (C. sakuni Horsfield and Papuan Subregion species)
In the female genitalia the apodemes of the eighth segment are
relatively much longer than in Tetragonus. A signum is sometimes
present in the bursa.
The genus is diverse throughout the Indo-Australian tropics east to the Solomons, but is not known from Australia (Common, 1990; Nielsen, Edwards &
Rangsi, 1996). The male genitalia and scent pencils of a pair of Papuan
Subregion species examined (arctata Butler, hypoleuca Butler),
apart from petavius, are similar to those of C. sakuni, though
there is great diversity of facies in both upper and undersides: the two
dissected species represent extremes of this range of facies, arctata resembling
the type species of Cleis, for which no males were located.
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