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Fascellina quadrata sp. n.  

Fascellina quadrata (paratype)

14-15mm. The species is smaller than the previous two and lacks a white discal patch on the forewing. It is a deep, rather maroon brown, fading to a more mottled red brown and yellowish colour in which darker fasciae are more evident than in castanea or albicordis. On the underside of the forewing the postmedial and submarginal do not enclose a darker brown area, but the postmedial is a strong, dark brown transverse fascia. The medial and submarginal fasciae of the hindwing underside are more widely separated than in castanea, with a faint discal lunule just distal to the centre of the medial. In the male genitalia the apex of the gnathus is diagnostically broadened, square-ended.

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), BM 1978-206, Site 16, March, Long Pala (Base) 70m, 324450, Alluv./secondary forest, BM geometrid slide 12717.

Paratypes: 1 as holotype: 1 SARAWAK: Santubong Mt. 300m 10.ix.1981 (Oxford Far East Exp.) BM geometrid slide 12714; 4 SARAWAK: Bidi (C.J. Brooks) (various dates and label styles).

Geographical range. Borneo, Sumatra.

Habitat preference The species is found in similar lowland habitats to those of castanea.

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