Miscellaneous Genera VI
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Rhesala fusiformis sp. n.
, 10-11mm. This and the next species are very similar in facies, larger than imparata, and having a distinctive black bar at the postmedial on the forewing costa. However, fusiformis is slightly smaller, slightly greyer and with generally more regular postmedial fasciae than the next. The labial palps are slightly shorter, particularly the third segment, and the second has its distal corners with scales slightly produced, making it appear more truncated. The male genitalia of the two species are also similar, differing from imparata particularly in the modification to the uncus, which has a large central expansion that bears the hair-setae, with a slender, curved apical section (this general pattern is more typical of more easterly taxa such as in Sulawesi (slide 18785 and New Guinea (slide 18665)). The saccular part of the valve is much shorter than in imparata in fusiformis, and the distal part is fusiform (spindle-shaped), with even convexity on the costal and ventral margins. The eighth abdominal sternite in both the new species has the central lacuna smaller, semicircular rather than circular, but the segment as a whole is similarly modified from the framed corematous condition to that of imparata. The female has a ductus and bursa smaller than in imparata, pyriform, with no sclerotisation in the corpus bursae except for a rasp-like sclerite at the junction with the small appendix leading to the ductus seminalis. Spining is restricted to the distal bulb.


Rhesala fusiformis

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D.Holloway et al.), Site 13, February, Camp 2, Mulu, 500m, 401464, mixed dipt. for., BM noctuid slide 10762

Paratypes: 1 (slide 18791) general data as holotype but Site 25, April, G. Api, 900m, 427550, lower montane forest; 1 as holotype but Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for.; 1 (slide 19226) as holotype but Site 15, February, Camp 2.5, Mulu, 1000m. 413461, lower montane forest; 1 Sandakan, BORNEO, April 1895 (Creagie).

Geographical range. Borneo, Singapore (H.N. Ridley material; slide 18790).

Habitat preference. The species is infrequent in lowland and lower montane forests to 1000m.

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