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SUBFAMILY
EUSTROTIINAE |
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Naranga Moore Type species: diffusa Walker, Sri Lanka. This genus contains two species with very similar facies and internal morphology, with the type species showing strong sexual dimorphism in the former. The species are delicate, with rather elongate, apically acute forewings that have a yellow ground colour with oblique, purplish red bands, one medially and one submarginally as illustrated. There is also a wedge of the darker colour in the basal yellow triangle. The hindwings are uniform. The body is a pale straw‑colour. The labial palps are porrect, not extending much beyond the head, with the third segment much shorter than the second. The male antennae are finely ciliate. The second abdominal tergite lacks phragma lobes. The male abdomen has the eighth segment unmodified. The genitalia have the uncus long, slender, strongly and evenly curved. The tegumen is short on each side and rather rounded; its junctions with the vinculum are complex, possibly involving a paratergal sclerite. There is no saccus, but the vinculum is deeper than the tegumen. The valves are long, slender, tongue-like, without processes. The aedeagus is slightly sigmoid. The female genitalia have the ostium at the posterior edge of the seventh sternite. The apodemes of the eighth sternite are slender and of normal length. The ductus bursae is very narrow and twice as long as the seventh segment. It expands very slightly over the distal half to the corpus bursae. The corpus bursae is spherical to ovate with a slight general rugosity over its interior surface. The abdominal features would be consistent with placement in the Eustrotiinae, particularly the structure of the female ductus and corpus bursae. In addition to the type species, the genus also includes N. aenescens Moore from Taiwan, China and Japan. Both can be rice pests. |
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