Arctornis discirufa Swinhoe
1903, Trans. ent. Soc. London, 1903: 384.
Diagnosis. This is the smallest of the pale yellow species and has less falcate
forewings that are distinguished by a prominent, rufous discal spot. The male
genitalia are also distinctive, indicating the species is not closely related to
any of the previous three: the uncus is narrow, tapering, and the valve has a
curved spine apically in addition to the harpe.
Geographical range. Borneo, Peninsular Malaysia, Sumatra.
Habitat preference. The species is never common but has been recorded
from a wide range of lowland forest types, including heath and coastal forests.
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