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Bembina isabellina Heylaerts comb. n.  
Porthesia isabellina Heylaerts, 1892, Annls Soc. ent. Belg., 36: 9.
Euproctis orgyioides van Eecke, 1928, Zool. Meded. Leiden, 11: 113.

Bembina isabellina

Bembina isabellina
(Peninsular Malaysia)

The sexual dimorphism is extreme, the female being uniform pale grey with a black discal spot on the forewing, and the male having a distinctive rather Orgyia-like, brown forewing facies with the medial zone distinctly paler and containing a white discal spot.

Taxonomic note. This rather incredible sexual dimorphism needs confirmation from a reared series that yields both sexes; the records in Yunus & Ho (1980) may represent this, but no further details have been located. However, the course of the pale postmedial and submarginal, the shading between them is the same in both sexes. B. nucula Swinhoe comb. n. (N.E. Himalaya) has males with similar forewings to isabellina but brown hindwings; females are unknown. These species and the next two are included tentatively in Bembina. The male abdomen lacks tymbals, the uncus is relatively broad, and the aedeagus has a few large cornuti in the vesica rather than patches of small spines. The valves are divided as in many Nygmia, however.

Geographical range. Sumatra, Peninsular Malaysia, Borneo.

Habitat preference. This is a rare species of lowland forest, with most specimens in recent surveys taken in heath or swamp forest.

Biology. The species has been reared from Cinnamomum zeylanicum (Lauraceae) in Peninsular Malaysia under both synonyms and (as isabellina) from Zea mays (Gramineae) (Yunus & Ho, 1980)

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