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Berta cercifera sp.n
10mm,
 11mm, The ground colour is a dull light green, the
white fasciation weak and rather punctate. There is a diagnostically darker
discal patch on the hindwing, more or less ringed with white spots. The male
abdomen suggests affinities with the Himalayan B. angustimedia Prout,
though this has facies more as in the previous species. The valves are rather
simple with the oblique groove relatively basad, rather more curved in cercifera.
The eighth sternite bears digitate processes set well laterally, relatively
short, broad in angustimedia, but long, digitate, rugose in cercifera,
like the cerci of more primitive insects.
Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S
Exped. 1977-8 (J.D.
Holloway et al.) Site 23, W. Melinau Gorge, 250m, 430558, FEG 4. limestone
forest, BM geometrid slide 16850.
Paratypes: 1 general data as holotype but Site 20,
Mar.-Apr., W. Melinau Gorge, 150m 422577, FEG 3, kerangas, BM geometrid slide
17306; 1 Pulo Laut, BORNEO, (Doherty) June '91.
Geographical
range. Borneo.
Habitat preference. All three specimens seen are from lowland localities, two from the
Mulu survey (kerangas, forest on limestone) and one from Pulo Laut to the south
west of Borneo.
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