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Thalassodes opalinoides sp. n.

Thalassodes opalinoides

16-19mm, 18-19mm. The facies and male genitalia indicate affinity to the Himalayan T. opalina Butler. The wings are rather translucent, the pale striae prominent, the marginal red markings virtually absent except at the hindwing angle. The most distinctive feature is that the ground colour grades darker towards the postmedials from the base and is abruptly paler just distal to them. In the male genitalia both species have on the valve a central subcostal flap, a rather slender acute spur at the distal end of the oblique structure, and a spine ventral to the transtillae. The eighth sternite has a central elliptical lacuna in the distal margin. T. opalinoides is distinguished by a smaller spine at the end of the oblique structure and a conspicuous scobinate, semicircular plate at the base of the basal spine.

Holotype  SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 25, April, G. Api, 900m, 492550, lower montane forest, BM geometrid slide 10691.

Paratypes: 2 SARAWAK: general data as holotype but Site 14 (slide 10689) and Site 19 (slide 10699); 1 BRUNEI: 16.8m, Bukit Retak, montane forest, 18.5.79. (Lt. Col. M.G. Allen), BM geometrid slide 8686.

Putative females associated with this species are identified by slide numbers 10711 and 10717.

Geographical range. Borneo.

Habitat preference. The species is found from the lowlands to the upper montane zone at around 1790m, but is commonest in the lower montane zone at around 1000m.

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