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Dinumma oxygrapha Snellen 
Heterochroma oxygrapha Snellen, 1880, Tijdschr. Ent., 23: 49.
Dinumma philippinensis Hampson, 1926, Descr. Gen. Spec. Noctuinae, p. 31. syn. n.
Dinumma combusta Walker sensu Chey, 1996: 82.

Dinumma oxygrapha

. Males can be distinguished from those of other Bornean species by their strongly fasciculate (cf. sparsely ciliate) antennae. The forewings can be dark and coloured as in the other species or as in the female where a paler greyish ground, variegated with diffusely darker, wavy fasciae, is broken by the dark medial band typical of the genus. The postmedial edge of this is less strongly angled than in the other species; the antemedial edge is distinctly dentate just subdorsally.

Taxonomic note. The original series of oxygrapha (in RMNH, Leiden) contains material of the member of the placens group mentioned in the note for D. combusta above, and the species just diagnosed. The illustration in the original description is of this species rather than of the combusta type, so a female syntype labelled ‘Celebes, Makassar’ that matches the illustration is hereby designated LECTOTYPE. The species is one of a series where the males have fasciculate antennae. The dorsal angle of the juxta is strongly rugose, and the female has a more oblique or stepped (in oxygrapha) anterior margin to the sterigma. The group includes varians Butler (India, Sri Lanka), where the aedeagus vesica has a narrow, transverse vesica like a pick-axe head with a row of spines across it, inangulata Hampson (Himalaya), where the male has genitalia as in oxygrapha, but the female has a more complex sterigma though one that is less stepped, and mediobrunnea Bethune-Baker (New Guinea, Queensland, Seram), where the male genitalia are similar to those of oxygrapha, but the female has a single lobe on each side of the anterior margin of the sterigma and a longer sclerotisation to the ductus bursae.

Geographical range. Sulawesi, Philippines, Borneo, Singapore, Bali, Dammer, Kei.

Habitat preference. Chey (1994) recorded the species in softwood plantations in Sabah; it was particularly frequent in those of Acacia mangium and Paraserianthes falcataria. Material in BMNH consists of two old specimens from Kuching in Sarawak and Sandakan in Sabah.

Biology. The early stages have been described and illustrated by Chey (1996), tentatively identified with the help of the author as combusta Walker (see above).

The larva is long, slender, green, rather geometrid-like, but with prolegs on A5 and A6, with fine, yellowish lines dorsolaterally and laterally, the latter broader. The pupa has a waxy grey bloom.

The species defoliates
Paraserianthes falcataria (Leguminosae) and can be a pest in plantations of this tree.

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