Hyposidra rufosarcuata sp. n.
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
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
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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