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Dysaethria walkeri sp. n.

Dysaethria walkeri (paratype)

9-11mm, 11-12mm. The wings are a warm, slightly brownish grey, the forewing with a fine, only slightly flexed postmedial and a definite but punctate antemedial. The facies resembles that of D. conflictaria Walker comb. n. (S. Moluccas), to which it is closely related, particularly in the stronger but diffuse dark brown shade on the hindwing that runs through the anterior side of the postmedial angle obliquely to the more posterior of the two tails. The forewing fasciation is stronger than in conflictaria. The male genitalia are close to those of conflictaria, having, along with the next two species, a central process to the uncus, with the more basal of the two lateral pairs of processes represented by vestigial, rounded lobes. The more distal pair is absent in conflictaria and its closest relatives. The valve is distally divided, though unequally, with the more interior part, associated with the transtillar bridge, much shorter. The transtillar bridge also has a pair of ventrally directed arms, in conflictaria and allies forming an H-shaped structure. The Bornean species has the central process of the uncus robust, somewhat triangular (rounded in conflictaria). The interior process of the valve and the ventral arms of the transtillar bridge are very much shorter, together about half the length of the valve rather than two-thirds. The ventral margin of the valve is indented slightly just beyond the apex of the sacculus. A further species in this group from Sulawesi (slide 420) has the uncus rounded, the interior distal process of the valve acute, and the lower arms of the transtillar bridge flexed out at right angles. D. perpolita Warren comb n. (Banda Is., Sulawesi) is a smaller species with more delicate male genitalia than the three species just discussed: the H-shaped structure is relatively small, its arms outcurved, and the aedeagus vesica contains a single long cornutus. A cornutus is present in the other Sulawesi species, but absent in conflictaria and walkeri.

Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 20, Mar.-Apr., W. Melinau Gorge, 150m. 422577, FEG 3 kerangas, BM uraniid slide 290.

Paratypes: 1 as holotype; l, 2 same general data as holotype but sites 12 (200m, G. Mulu), 15 (1000m, G. Mulu) and 26 (1200m, G. Api); 1 (slide 370) BRUNEI: 3m, Seria, secondary and coastal veg. 16.11.79 (Lt. Col. M. G. Allen); 1 BRUNEI: 15m, Daerah Belait, Badas, swamp forest, 27 Feb 82 (Lt. Col. M.G.Allen);2 BRUNEI: Seria, 5m, 9 & 16.iv.1981 (T.W. Harman); 2 BRUNEI: Rampayoh, 200m, 2.iii.1982 (T.W. Harman).

Geographical range. Borneo, ?Sumatra. (ZSM; not dissected).

Habitat preference. The species is infrequent, recorded from a range of forest types from the lowlands to 1200m, with some preference for forest on acid, nutrient-poor soils when in the lowlands.

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