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Ischyja
inferna Swinhoe
Ischyja
inferna Swinhoe, 1902, Ann. Mag. nat. Hist. (7),
10: 498.
Ischyja
inferna achysis Prout, 1928, Bull. Hill Mus. Witley,
2: 258.
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Ischyja
inferna  |
Ischyja
inferna |
Diagnosis.
In males, the species is distinguished by the oblique shape of the forewing
reniform, together with the shape of the loop mark on the dorsum, with its
investiture of black at and beyond its interior end and the creamy highlights
within this and near the dorsum. These last are faintly seen on the much more
uniform female. The hindwing blue band is relatively broad; the underside in the
typical race is pale blue to well distal to the postmedial fascia in the male,
but the female often has a pale blue band medially that is divided by a fine
brown fascia, though this band can be only weakly developed. The species is
unusual in the modification of the male hindwing venation (noted by Prout in
describing achysis)
in that veins M3 to CuA2 diverge more or less at the same point, rather than
having CuA1 and CuA2 diverging more distally from each other after divergence
from M3. See also the next species.
Geographical
range. Borneo, Peninsular Malaysia, Sumatra, Java, Lombok, Palawan,
Sulawesi. Thailand (VK); (ssp. achysis).
Habitat
preference. The species is commoner in the lowlands, but has been recorded
up to 1930m.
Biology.
The species was reared in Peninsular Malaysia from Saurauia (Actinidiaceae),
but pupated before a description could be made (H.S. Barlow, pers.
comm.).
The pupa was formed in spun-up leaves of the host plant and covered by a bloom
of grey-blue powder. The adult emerged just over two weeks after pupation. See
also under G.
marapok sp.
n. below.
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