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Tiruvaca
subcostalis Walker
Thermesia
subcostalis Walker,
1865, List
Specimens lepid. Insects Colln Br. Mus., 33: 1059.
Thermesia
falcata Pagenstecher, 1886, Jb. nassau. Ver. Naturk.,
39: 141.
Tiruvaca
subcostalis Walker;
Holloway, 1976: 38.
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Tiruvaca
subcostalis 
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Diagnosis.
This and the next species have facies typical of the genus (see above), and show
sexual dimorphism. In males of subcostalis the fasciation is weaker than in the
female, and the forewing has distorted venation and paler patches over the
central part of the wing, whereas in hollowayi Kobes
the fasciae are pronounced in both sexes, but the male has the distal margin
excavate subtornally. The species can most reliably be distinguished by the
medial and postmedial fasciae of the hindwing: these converge towards the costa
in hollowayi
but
run parallel towards it in subcostalis.
Geographical
range. Thailand,
Peninsular Malaysia and Borneo to Solomons.
Habitat
preference. The species is rare in the lowlands where it has been recorded
from primary forest, logged and cultivated areas. Chey (1994) found it generally
frequent in softwood plantations in the lowlands of Sabah. The highest record is
from 250m.
Biology.
Kuroko & Lewvanich (1993) recorded Durio (Bombacaceae) and Nephelium
(Sapindaceae)
as host plants, the larvae feeding on young foliage.
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