::The Moths of Borneo::

TRIBE CISTHENINI
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Tortricosia Hampson

Type species: excisa Hampson, Burma.

Synonym: Mellona van Eecke (type species blanda van Eecke), syn. n.

The relationship of this genus to the previous two is discussed above under Macaduma. Tortricosia species have a distinct angle on the forewing costa at about three-quarters, and the apex is slightly falcate (Fig 4h). The forewing facies is more finely streaked and mottled than in Oxacme.

Fig 4h: Tortricosia excisa Hampson

In the male abdomen the structures are much simpler than in the other two genera, with pairs of coremata on the sixth and seventh segments (Fig 150) with no obvious supporting structures as seen in Oxacme. The genitalia are similar to those of Oxacme, but the uncus is usually longer and the aedeagus vesica has general scobination in clusters of spines rather than a single large cornutus.

The female genitalia (excisa) have rather elongate ovipositor lobes, a pair of strange thumb-like structures that flank the ostium, and a spiny bursa that tapers away distally.

The genus is virtually restricted to Sundaland, with all included species occurring in Borneo. The genus Mellona shares definitive features with Tortricosia and is therefore brought into synonymy.

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