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.