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Rhombophylla Turner

Type species: xylinopis Turner, Queensland.

This genus is characterised by its wing shape, particularly the doubly excavate tornus of the hindwing, the excavations being between CuA1, CuA2 and the anal vein. The forewing is weakly bifalcate, only slightly so in the type species, with marginal angles occurring between R5 and M1, and at CuA1. The forewing facies of the Oriental species consists of straight, transverse fasciation, somewhat oblique, in the postmedial to submarginal zone of the wing. The wings of xylinopis are rich, medium brown with striae and diffuse paler variegation that distally may represent the 'ghost' of the pattern seen in the Bornean species, especially the dorsal part of the hindwing postmedial. The male antennae are uniserrate, lamellate.

The male genitalia have the uncus short, triangular, virtually contiguous with the tegumen. The gnathus is present, divided, consisting of strap-like processes on each side, or stronger spur-like processes in the type species. The valves are rather narrow, elongate, upcurved, with a zone of dorsally directed setae running the length of the interior just in from the ventral margin. The juxta is broad but weak, with small setose knobs on each side laterally. There is no saccus. The aedeagus is short to moderate, broader distally where it is adorned with spines of various sizes.

The female genitalia of the Bornean species have the ductus and bursa relatively small, flimsy, the former moderate in length, the latter pyriform with a small, indented, scobinate signum.

The biology of the Bornean species is described below.

The genus also includes R. rectimarginata Hampson comb. n. (India), a species that conforms in wing shape and male genitalic features with the generic characteristics except the aedeagus is simple, slender, longer.

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