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Biston inouei sp. n.
35-37mm. This is the largest Bornean species, clearly
distinguished by the unbroken, biangular forewing postmedial and the strong,
single, complete antemedial. The hindwing postmedial is similarly sharply
defined. There is some similarity in appearance to B. contectaria Walker
(India) and B. luculentus Inoue (Thailand) but the species is larger with
a more distinct hindwing medial, a broader, straighter forewing antemedial, a
stronger medial black suffusion on the costa, and more black suffusion between
the anterior angle of the forewing postmedial and the margin. The underside is
more strongly marked, especially the forewing antemedial, than in luculentus.
The male genitalia resemble those of luculentus and pustulata.
Holotype . Bukit Pagon, LP 308, 1618 metres, BRUNEI, 28. iv.1981 (T.W Harman)
Paratypes. 2 SARAWAK: Gunung Mulu Nat. Park, R.G.S
Exped. 1977-8 (J.D. Holloway
et al.) Site 14, February, Camp 2.5, Mulu, 1000m. 413461 [lower
montane forest], BM geometrid slide 13710.
Geographical range. Borneo.
Habitat preference. The three specimens taken are from montane forest.
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