Chadisra basivacua Walker
basivacua Walker, 1862, J. Linn. Soc. Lond. Zool. 6: 134.
1967: 59, syn. n.
Kiriakoff 1968; 214.
sensu Barlow 1982: 64.
Diagnosis. The pale basal zone of the male forewing is edged darker distally; the
area within the 'step' of the pale zone margin at the dorsum is usually the
same colour as the distal half of the wing, rarely fawn (in both sexes). In both
sexes there is only a single black streak associated with the forewing subapical
costal mark. The female has the exterior half of the forewing a clear, pale,
greenish grey; in the genitalia the ductus bursae has a sclerotised ventral lobe
and the ostium bursae is flanked by angled, posteriorly directed projections of
the lamella vaginalis.
Taxonomic notes. The male genitalia illustrated for this species by Kiriakoff (1968) are
those of an unrelated Sumatran male in the BMNH which appears to belong to an
undescribed species that may be related to borneensis (below): it shares
the deep, heavy, fused transtilla but this bears one central spine instead of a
pair of spines.
The holotype of basivacua has male genitalia identical to those
illustrated by Kiriakoff for Chadisrella javensis Kiriakoff. Therefore
the two names are brought into synonymy and Calapana Kiriakoff must
become a junior synonym of Chadisrella Kiriakoff, syn. n. Chadisra (Chadisrella)
celebensis Kiriakoff from Sulawesi has similar genitalia and is probably the
sister species of basivacua.
Geographical range. Sundaland, ?Philippines if calapana Semper is
indeed a synonym of basivacua as set out by Kiriakoff (1968).
Habitat preference. The species is uncommon in lowland rain forest.
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