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Orgyia basinigra Heylaerts comb. n.
Olene basinigra
Heylaerts, 1892, Annls Soc. ent. Belg., 36: 11.

Orgyia basinigra

Orgyia basinigra

The irregularly transverse pale medial band on the forewing of both sexes that encloses the discal stigma is diagnostic. In the male genitalia the juxta process is short as in osseata, but the dorsal arm of the valve does not have a central projection and is flexed slightly upwards at the centre.

Geographical range. Sundaland.

Habitat preference. O. basinigra is encountered infrequently in natural lowland forest, but is more often taken in plantation forests (see below).

Biology. Chey (1996) described and illustrated the larva. Early instars are mostly black with a partial dorsal white band over the central abdominal segments and more extensive white ventrally. The setae are long and white, and dorsal brushes only occur on the first two abdominal segments. Later instars are more generally dark but with a reddish head and the full complement of four orange-yellow brushes dorsally. Most setae are still pale, but there are dark lateral tufts on each side of the head and a dorsal one posteriorly.

Host-plants recorded by Chey were Parashorea (Dipterocarpaceae) and Acacia mangium (Leguminosae), but the species has also been recorded from Pueraria (Leguminosae); Theobroma (Sterculiaceae) and unidentified Zingiberaceae (unpublished IIE records; H.S. Barlow colln; S.J. Willott, pers. comm.).

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