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Berta tridentijuxta sp. n

Berta tridentijuxta

10-11mm. The white patches of the wings are more even in size and more evenly spaced than in other species, particularly on the hindwing, standing out clearly against the relatively dark ground colour. The male genitalia have a digitate process on the valve costa subbasally and a trifid juxta, the central prong much longer than the lateral ones. The eighth sternite is unmodified.

Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 25, April, G. Api., 900m, 427550, lower montane forest, BM geometrid slide 16847.

Paratypes: 1 as holotype; 1 same general data but Site 20, W. Melinau Gorge, 150m 422577, kerangas; 1 BRUNEI: 3m, Seria, secondary and coastal veg. 30.12.78 (Lt. Col. M.G.Allen).

Geographical range. Borneo, Sulawesi (slide 17315), Seram (slide 12563).

Habitat preference. The type series is from coastal forest, wet heath (kerangas) forest, and lower montane forest at 900m on limestone.

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