Specimens lepid. Insects Colln Br. Mus., 33: 928.
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
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
typically from the Indian Subregion, it is also recorded from Japan (Inoue et
1982; Sugi, 1987) and probably occurs in intervening areas. A similar-looking
species in Sulawesi (see comments on the mixed syntypic series of oxygrapha
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.
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.
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.
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
plant noted by Bell was Albizia (Leguminosae). Robinson et
noted also Archidendron (Leguminosae), Coffea
and Miyata (1983) and Sugi (1987) recorded Pithecellobium (Leguminosae).
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