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