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Biston inouei sp. n.

Biston inouei (holotype)

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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