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Dinumma combusta Walker
Ortheaga combusta Walker, 1865, List Specimens lepid. Insects Colln Br. Mus., 33: 928.
Dinumma placens Walker sensu Holloway, 1976: 32.

Dinumma combusta

. This is the largest of the three Bornean species and the one with the most intensely indigo-blue tone to the forewings, which are generally darker and more uniform than in the next two species. The forewing postmedial is relatively more distal, having a particularly strong angle projecting distad at one third from the costa; the antemedial is distinctly zig-zag. There is a conspicuous dark discal mark in the medial area between these fasciae that is not evident in the other species.

Taxonomic note. The female genitalia and the aedeagus vesica ornamentation are inseparable from those of placens and show some variability, but the basal process to the valve in the male is diagnostically bifid. Though placens is typically from the Indian Subregion, it is also recorded from Japan (Inoue et al., 1982; Sugi, 1987) and probably occurs in intervening areas. A similar-looking species in Sulawesi (see comments on the mixed syntypic series of oxygrapha Snellen under that species below) has more robust male genitalia with an undivided basal process to the valve. The spines on the large diverticulum of the vesica radiate away from its apex rather than being aligned in the same direction along it. In these features, this Sulawesi species resembles species further east in New Guinea. The placens group is represented in New Guinea by D. hades Bethune-Baker and D. stygia Hampson, possibly conspecific, having very similar male genitalia with an aedeagus vesica typical of the group. Paralopha rubiginea Bethune-Baker may represent the female and is the type species of its genus, brought into synonymy in the generic description.

Geographical range. Sundaland.

Habitat preference. This is the commonest of the three Bornean Dinumma, found in a wide range of habitats from the lowlands to 1930m. The species is less 0frequent above about 1000m.

Biology. Bell (MS) described the larva of placens. The prolegs on A3 and A4 are absent. The body is long, slender, geometrid-like, as is the looping locomotion. The larva is a light greyish green with a broad whitish line dorsally, flanked by three more parallel lines on each side. There is also a broader yellow spiracular line. The head is a light yellowish green. Pupation is in a slight web that incorporates leaves. The pupa is covered with a bluish white, powdery bloom.

The host plant noted by Bell was Albizia (Leguminosae). Robinson et al. (2001) noted also Archidendron (Leguminosae), Coffea (Rubiaceae) and Tectona (Verbenaceae), and Miyata (1983) and Sugi (1987) recorded Pithecellobium (Leguminosae).

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