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Amata
derivata Walker
Syntomis derivata Walker, 1862, J. Linn. Soc. Lond. (Zool.) 6:
89.
Syntomis derivata Walker; Seitz, 1912-1913: 73.
Diagnosis. This species has narrow forewings and white abdominal rings as in brooksi.
The forewing patches are relatively much enlarged but also elongated; the
apex is very massively marked with white as in stellaris Snellen. In the
male genitalia (Perak specimen) the aedeagus vesica has a single row of cornuti,
those in the centre of the row longest, those in its basal part moderate, and
those in the distal part small. The right valve is triangular as in brooksi but
the costal angle is obtuse rather than acute; the distal edge of the triangle is
densely invested with short, dark setae. These setae spread over a more
irregular area on the slightly tapering left valve. The basal costal processes
are similar to those of stellaris.
Geographical range. Borneo, Peninsular Malaysia, Sumatra.
Habitat preference. The Bornean specimens seen are from Bidi and the
Baram district of Sarawak.
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