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Bosara reductata sp. n.  

Bosara reductata (holotype)
(x 1.47)

5-6mm. This species is much smaller than dilatata and more strongly marked. The male lacks a crest of scales on the forewing costa, though this is somewhat bowed. The colour is greyer than in dilatata, with the biangular postmedial of the forewing emphasised by darker grey. The male genitalia are of the typical Bosara type, but with a small exterior lateral spine to the octavals not seen in Bornean congeners. The valves are narrow, the saccular projection rather rounded, less acute than in dilatata or other Bornean species. The female genitalia are similar to those of dilatata but the ductus is longer, more ribbon-like, the bursa is much more lightly spined and its sclerotised appendix less strongly developed.

Holotypes . SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 3, January, Camp 4, Mulu 1780m. 453463 [upper montane forest], BM geometrid slide 19079.

Paratypes: 2 as holotype, slides 10780, 10781; 2 (prep. 6468) SABAH (N. Borneo): Env. de Ranau, Kundasang, 1200m 30/31 .iii.1987 (C. Herbulot) (Colln Herbulot).

Geographical range. Borneo; a series from Peninsular Malaysia in the Barlow Collection may also be this species.

Habitat preference. All material is from upper montane forest except for one taken at just under 600m at Poring near G. Kinabalu and one taken at sea off the coast of northern Sarawak (4.25N, 113.43E). Only dissected material is given type status.

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