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“Tamba”
dichroma
Prout
Tamba
dichroma Prout, 1932, Bull. Hill Mus. Witley,
4: 283.
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“Tamba”
dichroma
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Diagnosis.
This is the only really strongly sexually dimorphic species. Males have a more
produced forewing apex than females and straighter more clearly doubled
postmedials, that of the forewing more sharply angled. Males are greener-grey
basal to the postmedials, more mottled with grey distal to them. Females are a
darker, more violet grey distal to the postmedials and basal to the forewing
antemedial; within the forewing marginal zone there is a darker green area with
jagged distal edges extending from the anterior two thirds of the postmedial.
Taxonomic
note. Characters of the male abdomen indicate this is not a true Tamba.
The eighth segment, though of the framed corematous type, lacks the features
described for Tamba
on
p. 351, the sternite lacking a lacuna and having the midline constricted. The
posterior fringe of setae is very narrow. The valve has a costal spur and a
central digitate process similar to those of Dunira Moore,
but lacks the trilobed apex seen in Dunira, and also the processes that
characterise Tamba. The aedeagus vesica is globular, with three well separated
bands of small, needle-like spines. The female genitalia have the ostium
associated with the eighth segment, but there is no scobinate, pouched sterigma.
The apodemes of the eighth segment are moderate in length. The ductus is short,
sclerotised, and the corpus bursae is robust, with the ductus seminalis arising
laterally from it, well separated from the junction with the ductus.
Geographical
range. Peninsular Malaysia, Sumatra (HS / K), Borneo, Thailand (VK).
Habitat
preference. The species is frequent in lowland forest. One specimen was
taken at 1200m in stunted hill forest on Bukit Monkobo in Sabah.
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