Hypsa egens Walker, 1854, List Specimens lepid. Insects Colln.
Br. Mus., 2: 453.
Hypsa nebulosa Butler, 1875, Trans. ent. Soc. Lond., 1876:
Asota egens Walker; Holloway, 1976: 5.
Diagnosis. This species is almost pure yellow above, though some specimens are
clouded with brown. The underside has a number of large black spots; a group of
small black spots occurs at the base of the forewing upperside.
Taxonomic notes. There are numerous named races of egens throughout its range. The
typical race flies in India. Bornean material is referable to ssp. nebulosa Butler.
Geographical range. Japan, Oriental tropics and east to New Guinea.
Habitat preference. This is a predominantly lowland species with some
preferences for secondary forest, but has been recorded from as high as 1900m.
Biology. The larva and pupa of Javan egens were illustrated by Horsfield
& Moore (1858-9). The larva is medium brown with a darker dorsal stripe. The
setae are long, set on prominent, dark chalazae. The host-plant was Ficus (Moraceae).
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