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Trigonodes Guenée

Type species: hyppasia Cramer, India.

Species of this genus, Parachalciope Hampson, and Chalciope of the previous section have a similarly patterned forewing with two black triangles divided by a pale band that together form a larger triangle. The first two genera have these triangles separated from the dorsum by a longitudinal strip of ground colour whereas in Chalciope the basal triangle is adjacent to the dorsum and the more distal one has its costal side edged white. The band between the triangles is much more oblique in Chalciope. The male antennae are ciliate. The third segment of the labial palps is only moderate, though not as short as in Chalciope.

The male eighth segment is unmodified except for a small circular lacuna at the anterior of the sternite, seen also in the next genus. The male genitalia have the uncus apex of a flattened ball-and-claw form, and there is a strong scaphium. The valves are tongue-like and show bilateral asymmetry of either the most distal, spine-like process or in the apex of the sacculus. The juxta is of the inverted ‘Y’ type but also shows some asymmetry. There are no coremata. The aedeagus vesica is convolute, and scobinate in places.

The female genitalia of the type species have a very broad, funnel-like ostium under a prominent, square antevaginal plate from the seventh sternite. The ostium leads into a narrow, sclerotised ductus that itself gives rise to an ovate corpus bursae that is finely scobinate throughout, with the ductus seminalis arising subbasally from it.

Most species are found in the Indo-Australian tropics but there is one in the Caribbean.

The biology of both widespread Indo-Australian species is described below. Larval hosts are mainly in the Gramineae and Leguminosae.

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