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Orvasca bicolor Heylaerts comb. n
Artaxa bicolor Heylaerts, 1892, Annls Soc. ent. Belg., 36: 10.

Orvasca bicolor

Diagnosis and taxonomic notes.
The facies is similar to that of subnotata, but the shaded areas are darker, browner, and the pale fasciae are more diffuse. The male genitalia are typical of Orvasca, with the upper arm of the valve larger than the lower, rather rectangular, similar to that of limbata Butler, which has facies much closer to that of subnotata, as discussed above. There is a further species of the group in Java (slides 1964, 2743), with a more "washed out” , greyer facies. The name bicolor Heylaerts would be a junior secondary homonym of Orgyia bicolor Walker if the two were to remain in the old concept of Euproctis: bicolor Walker is similar to "Euproctis” flavicosta Hampson (Sikkim) in facies.

Geographical range. Sumatra, Borneo, Peninsular Malaysia (host records).

Habitat preference. Only three Bornean specimens have been seen: males from 300m in Ulu Temburong, Brunei, and 900m on the limestone G. Api; a female from the understorey of primary forest at 170m near the Danum Valley Field Centre, Sabah.

Biology. Unpublished records at FRIM give Shorea (Dipterocarpaceae), Glochidion (Euphorbiaceae) and Acacia (Leguminosae) as larval hosts.

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