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Astygisa stueningi sp. n.

Astygisa stueningi

14-15mm. This is a reddish brown species with more extensive white clouding on the wings than in congeners, yet with the hindwing discal spot obscure or a minute white dot. The strong broad medial band of white clouding on the forewing is diagnostic, seen much more weakly in metaspila and the next species. A circular area of clouding is present in the centre of the margins of both wings. The male genitalia resemble those of the next species in having socii as long as the uncus and valves that are slender, strap like over the distal part and terminating squarely with a row of long setae along the distal margin, the aedeagus is slender in both species, lacking cornuti. The dorsal margin of the sacculus is more strongly and extensively bowed in stueningi; the distal part of the valve is relatively shorter, broader in waterstradti, the setae at the distal margin differentiated into long, ventral, erect ones and shorter ones directed dorsally over the dorsal two thirds of the margin. The female genitalia have few (three or four) irregular ridges with spines in the ductus bursae, and a complex, narrow, bidentate lamella vaginalis.

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), BM 1978-206, Site 20, Mar-Apr, W. Melinau Gorge 150m. 422577 FEG3 kerangas, BM geometrid slide 12695.

Paratypes: 1 as above but Site 22, Apr., W. Melinau Gorge, 150m, 421578, kerangas, BM geometrid slide 13023; 5 as above but Site 13, February, Camp 2, Mulu 500m, 401464, mixed dipt. for.; 1 BRUNEI: 30-60m, Labi, lowland forest and secondary veg. 10.9.79 (Lt. Col. M.G. Allen); 1 S.E. BORNEO: Samarinda x.1938 (M.E. Walsh) BM 1939-182; 1 Dutch West BORNEO: 85 miles above Pontianak (Simons et Neligan (Sanagan)) ex Janson April 1909; 1 Sabah, 1km 5. Kundasang, el.1530m 24 Aug. 1983 (G.F. Hevel & W.E. Steiner) in USNM; l SABAH: Env. de Ranau, Kundasang. 1200m, 1.iv. 1987 (C. Herbulot) in colln Herbulot.

Geographical range. Borneo, Sumatra, Peninsular Malaysia.

Habitat preference. This is a lowland forest species showing some preferences for forest on acid soils. During the Mulu survey it was taken in kerangas forest and at 500m in hill dipterocarp forest on G. Mulu where some botanical kerangas elements were present. The highest record is represented by the penultimate paratype listed.

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