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Macaduma Walker

Type species: tortricella Walker, Java.

This and the next two genera appear to be related. All have the forewing irregularly shaped (Figs 4f, h, i), with an angle or strong arching on the costa, and a protrusion on the distal margin: at the terminal branching of the Rs system in Oxacme Hampson and Tortricosia Hampson, but in the medial sector in Macaduma. All veins arising from the forewing cell are present in the first two genera, but the radial sector branching system is reduced to two in some Macaduma (e.g. the type species) from three (this is (R3 (R4, R5)) as in Utriculofera). Tortricosia has M3 stalked with CuA1. In the hindwing, all have Rs and M1 stalked, but the more posterior veins vary: M2 is lost in Tortricosia, with M3 and CuA1 stalked; M3 and CuA1 are totally fused (or one lost) in Oxacme (and also Utriculofera); all veins are present in Macaduma, with M3 and CuAl stalked.

Fig 4f: Macaduma tortricella Walker

Fig 4h: Tortricosia excisa Hampson

Fig 4i: Oxacme dissimilis Hampson

The male abdomen of all three has complex corematous structures; these are on segments 3 to 6 in Macaduma (Fig 152) and on 6 to 8 (sometimes also 5 in Oxacme) in the other two genera. The male genitalia of Macaduma have a number of distinctive features: the uncus broadens towards the apex, shaped somewhat as in a parang or machete, though apically acute; the valves appear undivided, but this may be through reduction of the dorsal portion at the expense of the saccular process, and bilaterally asymmetric. All three genera have the characteristically twisted, lobed appearance of the paratergal sclerites at the junction of tegumen and vinculum on each side that has its greatest development in the Garudinia generic complex, and the ductus ejaculatorius of the aedeagus is often sclerotised as in that group.

The female genitalia of Macaduma (tortricella) have a scobinate signum and a prominent appendix bursae, whereas those of the other two have the bursa more generally spined.

Macaduma has its greatest diversity in the Australian tropics, particularly New Guinea, extending weakly east to New Caledonia, Fiji and Samoa (Holloway, 1979) and west to the Himalaya (the type species, though material included in the BMNH series, extending through the Indo-Australia tropics, needs revision through dissection; specimens from Bali were examined in the course of this work). One new species occurs in Borneo.

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