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Diplurodes semicircularis sp. n.  

Diplurodes semicircularis (paratype)

13-14mm. This species is similar to the previous one but the forewings are deeper, and the postmedials on both wings are more strongly angled. There is a small additional pair of coremata between segments 3 and 4 in the male, and the genitalia are distinguished by a broadly semicircular plate extending from the ventral edge of the valve costa. The saccular sclerotisation is distally rounded, unspined. The tongue-like process on the tegumen is weak.

Holotype . BRUNEI: 1618m, Bukit Retak, montane forest, 14.9.1979 (Lt. Col. M.G. Allen). BM geometrid slide 16407.

Paratypes: 1 SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 11, February, Camp 1, Mulu, 150m, 385970, mixed dipt. for., BM geometrid slide 10443; 1 SARAWAK as above, Site 23, April, W. Melinau Gorge, 250m, 430558 FEG 4, Limestone, BM geometrid slide 10441; 1 SARAWAK: Santubong Mt., 300m, 9.ix.1981 (Oxford Far East Exp.) BM geometrid slide 13180; 1 BRUNEI: 15m. Daerah Belait, swamp forest, 20.12.79 (Lt. Col. M. G. Allen) BM geometrid slide 13181.

Other material. Further specimens probably of this species but not dissected were taken during the Mulu survey at the following sites: 8, 11, 13, 20, 25.

Geographical range. Borneo, Peninsular Malaysia (FRIM collection), Sumatra.

Habitat preference. Though uncommon, the species occurs over a wide altitude range, from the lowlands to the upper montane zone.

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