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Isana eugenes Prout comb. n.
     Elyra eugenes Prout, 1928, Sarawak Mus. J., 3: 470.

Isana eugenes
Figure 38
Figure 112

The forewings are more finely fasciated than in the previous species, but the postmedial has a similar zig-zag course. However, the postmedial is angled near the discal spot, the angle reaching one of those on the submarginal. The antemedial is straight, transverse, and both it and the postmedial have dark then paler lining on their medial side, enclosing the pale discal mark in an irregular quadrilateral. The hindwings are paler, greyer, more uniform, with only diffuse fasciation. The male antennae are strongly bipectinate.

Taxonomic note. Retention of this species in Isana is tentative, based primarily on facies. The male antennae are atypical, and the labial palps have the third segment shorter than the second, though still tufted. The foreleg is typical of the genus. The male abdomen is as in other species of the genus but the genitalia have valves that lack a costal spur near the apex, which is oblique, rather than rounded, and the sacculus is more finely setose and is produced into a slight lobe on the margin distally. The aedeagus vesica has only slight diverticula, but is characterised by an extensive field of scobination distally, within which are scattered several much larger but very short, rather globular spines.

Geographical range. Borneo.

Habitat preference. This is an infrequent species of montane forest from between 1200m and 1790m, recorded from G. Penrissen, G. Mulu, G. Murud and G. Dulit in Sarawak, Bukit Retak in Brunei and G. Monkobo in Sabah.

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