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Problepsis borneamagna sp. n.
Problepsis korinchiana Rothschild sensu Holloway 1976: 64.

Problepsis borneamagna

17-19mm. In facies this species most resembles apollinaria of the other Bornean species but is more heavily marked, with a longitudinal black streak in the forewing ocellus but less silver edging along the diffuse pale brown medial band continuing to the tornus. The ocelli on both wings are somewhat broader. In P. korinchiania Rothschild, a montane Sumatra species, the markings are darker still, the postmedials more irregular in course to skirt larger elements in the submarginal row of grey patches. The male genitalia are similar to those of apollinaria but the aedeagus is much shorter, and the interior margin of the tegumen is lined with spines that are absent in apollinaria. In korinchiana the aedeagus is very slender, as are the two valve processes, but the uncus is very much broader than in the Bornean species. The spines on the interior of the tegumen are more slender, directed away from the uncus rather than towards it. The facies and male genitalia indicate a close relationship to P. magna Warren (New Guinea), though the wing markings are generally slightly darker. The male genitalia of magna have fewer spines lining the interior of the tegumen, the shape of which is more like a gothic arch, and the exterior is more square-shouldered. The saccus is more deeply bilobed. The aedeagus apex of magna is also more complexly lobed.

Holotype . SABAH: Mt. Kinabalu 5000ft 3.5.1973 (K.M. Guichard) BM geometrid slide 17775.

Paratypes: 1 SABAH: Mt Kinabalu, Park HQ., 1620m vii-ix.1965, Cambridge Expedition to Mt Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway) BM geometrid slide 9003; 1 BRUNEI, 1670m, Bukit Pagon, montane forest, Feb. 1982 (Allen & Harman) BM geometrid slide 19172; 1 BRUNEI: 1618m Bukit Retak, montane forest, 14.9.1979, (Lt. Col. M.G. Allen):2 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; 1 SARAWAK as above but Site 1, January, Camp 4, Mulu 1790m 452463 [montane forest]; 2 BORNEO: Sabah, Bukit Monkobo (Camp 1, 1200m and summit, 1775m) viii.1987 (A.H. Kirk-Spriggs)

Habitat preference. Most material has been taken in upper montane forest but two specimens were collected from lower montane forest at 900m on the limestone G. Api.

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