basinigra Heylaerts comb. n.
Olene basinigra Heylaerts, 1892, Annls Soc. ent. Belg., 36:
Diagnosis. 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unidentified Zingiberaceae (unpublished IIE records; H.S. Barlow colln; S.J.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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