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Chorodna pseudobolima sp. n. 
Medasina embolima Prout, sensu Holloway, 1976: 79.

Chorodna pseudobolima

Chorodna embolima

36-38mm. This species resembles C. embolima Prout comb. n. (Sumatra, Peninsular Malaysia:  Fig. 429) closely. The pale forewing costal band is clearly distinguished from the rest of the wings, this being darker, duller brown than in embolima. The margins are also dark, giving prominence to the pale submarginals. The male genitalia have the distal costal process longer and more acute than in embolima or the next species. The dorsal margin of the costa has the hair-bearing process shallow: it is strongly produced in the other two species. The saccular process is a long, narrow, digitate process directed towards the tip of the distal costal lobe; it has a small, obtusely triangular flap subbasally. The width of this digitate process is variable. The aedeagus vesica lacks cornuti.

Holotype . BRUNEI: 1618m, Bukit Retak, montane forest, 14.9.79 (Lt. Col. M. G. Allen) BM geometrid slide 13326.

Paratypes: 1 as holotype; 1 LP298, Ulu Temburong, BRUNEI, 300 metres, 16.ii. 1982 (T. W. Harman); 2 SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 12 (slide 13329), February, FEG 2, Mulu, 200m. 386469, mixed dipt. for., and Site 20 (slide 13325), March, W. Melinau Gorge, 150m, 422577, FEG 3, kerangas; 1 SABAH: Mt Kinabalu, Mesilau, 1500m. vii.ix.1965, Cambridge Expedition to Mt Kinabalu, 1965 (H.J. Banks, H.S. Barlow, J.D. Holloway) Brit. Mus., BM geometrid slide 13331.

Geographical range. Borneo.

Habitat preference. The species ranges from the lowlands to 2200m, but is possibly more frequent in montane forests.

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