The Saroba group of genera
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Tambadichroma Prout 
Tamba dichroma Prout, 1932, Bull. Hill Mus. Witley, 4: 283.


. 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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