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Isana larusalis Walker comb. rev.
     Isana larusalis Walker, [1859] 1858, List Specimens lepid. Insects Colln Br. Mus., 16: 213.

Isana larusalis
Figure 114
Figure 121

This and the following four species share a common facies of reticulated fasciation in creamy white on dark brown. There is also a reniform of the same colour with a dark centre. The forewing antemedial and postmedial are straight, oblique, parallel, the postmedial with pale dentation often extending it distad. The submarginals are zig-zag, remaining separate from the postmedial of the forewing in larusalis. The hindwing postmedial is generally straight. The hindwings of females have a much darker ground than those of males. This species and the next two are very difficult to separate on external features, but larusalis is slightly smaller and has a distinct black lunule in the centre of the reniform. On the forewing, the interior edges of the pale bands flanking the medial zone are straighter, and the zig-zag of the submarginal tends to be finer and more clearly defined. The basal area of the white band along the costa contains only a small black streak rather than the more extensive marking of the other species. The main differences are in the aedeagus vesica of the male genitalia as described for the two other species below.

Geographical range. Borneo, Peninsular Malaysia (Barlow colln).

Habitat preference. The species is infrequent in lowland forest, particularly heath and alluvial forest. One specimen was taken at 900m in lower montane forest on the limestone G. Api.

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