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Hyposidra rufosarcuata sp. n.  

Hyposidra rufosarcuata (paratype)

19-21mm. The ground colour is yellowish fawn as in H. infixaria. The markings, in rich rufous brown, are similar but there is no subcostal streak to the forewing, and the outer components of the postmedials are weak. The margins of the wings are broadly darker, distal to the distinctively arcuate inner component of the forewing postmedial, and distal to the weak outer component of that on the hindwing. The forewing discal spot is prominent, black, that of the hindwing weaker. There are submarginal rows of pale lunules of irregular intensity, some enclosing darker brown colour. The male genitalia have a sclerotised band in the vesica of the aedeagus similar to that of infixaria, but lack a process from the valve sacculus. Both costal and ventral margins of the valves are lined with robust setae, and there is a conspicuous, distally directed cluster near the base of the costa. The ventral margin of the valve is distinctively stepped. A pair of sabre-like setae (or possibly fused setae), arising from short pedestals, forms a furca at the point of fusion of the valve bases. A similar furca structure and robust valve setation is seen in two related species from Sulawesi. One resembles H. infixaria in facies but is larger, with forewings more falcate (slide 16052) and the other is darker and has already been mentioned in the discussion of H. violescens above (slide 16286).

Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 9, February, Camp 1, Mulu, 150m, 884470, mixed dipt. for., BM geometrid slide 10406.

Paratypes: 1 as holotype; 3 same general data as holotype but Site 7 (January, Long Pala, 50m, 324450, alluvial/secondary forest), site 19 (March, W. Melinau Gorge, 100m, 427567, alluvial forest) and Site 22 (April, W. Melinau Gorge, 150m, 421578, wet kerangas); 2 BRUNEI: 300m, Ulu Temburong, rainforest, 30.6.1979 (Lt. Col. M.G. Allen); 1 BRUNEI: Temburong, LP298, 300m, 15.ii.1982 (T.W. Harman); 1 S.E. BORNEO: Samarinda, xii.1938 (M.E. Walsh) BM 1939-182.

Geographical range. Borneo, Sumatra.

Habitat preference. All material is from lowland forest.

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