Orvasca bicolor Heylaerts
1892, Annls Soc. ent. Belg., 36: 10.
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
Biology. Unpublished records at FRIM give Shorea (Dipterocarpaceae), Glochidion
(Euphorbiaceae) and Acacia (Leguminosae) as larval hosts.
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