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Didigua purpureoscripta Walker stat. rev.
Didigua purpureoscripta Walker, 1862, J. Linn. Soc. (Zool.), 6: 181.
Didigua chalybea Warren, 1916, Novit. zool., 23: 221, syn. n.
Didigua chalybea Warren; Kobes, 1997: 154.


Didigua purpureoscripta

This and the next species have very similar facies, but the forewing of purpureoscripta is more heavily marked with bluish black, and the hindwing is usually darker. Both have the forewing markings typical of the genus on a grey ground, but the postmedial is much closer to the reniform mark in purpureoscripta, and the reniform is generally more emphatic. In the male genitalia the aedeagus vesica of purpureoscripta is small and lacks the cornuti of seticornis. The valve is broader, especially basally, and is invested with a dense array of deciduous scales over its distal part. The costal process is more prominent.

Taxonomic note. This species was retained as a synonym of seticornis by Kobes (1997; illustrated in Plate VI: 208 as D. seticornis sumatrana Roepke), following Poole (1989), but is distinct. The facies of chalybea is similar but more intensely developed, with a darker hindwing; the male genitalia are, however, not separable from those of purpureoscripta. It is possible that the even more intensely marked D. eloka Kobes from the mountains of Sumatra is also very closely related. The male genitalia are very similar, but the forewing is heavily suffused with black distal to the postmedial and basal to the antemedial, with further black crossing the medial zone obliquely from the postmedial at the costa to the antemedial at the dorsum.

Geographical range. Borneo, Sumatra.

Habitat preference. This is an infrequent species of lowland forest, no specimen being taken higher than 150m. Much of recent material has been taken in an area of dry heath forest at Telisai in Brunei. In the Danum Valley Field Centre area it occurred in both logged and unlogged forest.

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