Pergesa aegrota Butler, 1875, Proc. zool. Soc. Lond., 1875: 246.
Cechenena aegrota Butler; Rothschild & Jordan, 1903: 800.
Diagnosis. This insect is pale ochreous brown, distinctively marked with
blackish brown, the hindwings are mostly the latter colour. The multiple
forewing postmedial is irregular, only slightly oblique, angled sharply
basad at the costa where it is conspicuously darker; it is otherwise only
conspicuously darker at the dorsum. The abdomen has a fine dark brown
longitudinal line laterally.
Geographical range. N. India to Sundaland.
Habitat preference. Harman (1982) noted the species to be found in a wide
range of localities in Brunei. During the Mulu survey only two specimens
were taken, both in regenerating alluvial forest beside a river.
Biology. The larvae were described by Dupont & Roepke (1941). There
are two colour forms, of mature larvae, green or purplish red; young
larvae are always green, marked with white. In the green form there are
ocellar markings on A1, blue with white spots, ringed white then black;
white lines run from the ocelli to the head. The lateral area has oblique
dirty white and yellow stripes marked with black dotted lines. The horn is
rather short, pinkish, downcurved. The purplish form is similarly marked
but with green centred ocelli, and black lines to the head from them; the
oblique lateral stripes are greenish; the horn is purplish brown.
The recorded host-plant was Psychotria (Rubiaceae).
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