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Gymnoscelis pseudotibialis sp. n.  

Gymnoscelis pseudotibialis
(holotype) (x 1.16)

7-8mm. This species belongs to a complex of very similar brown species with strong fasciation, the postmedials usually at least shallowly biangular. Included are lophopus Turner (Queensland, New Guinea), mesophoena Turner (Queensland), pyrissous Prout (Sumbawa) and tibialis Moore. They are best distinguished on genitalic features, particularly the cornuti in the aedeagus vesica and the modification, probably corresponding to the character of the cornuti, of the ductus and basal part of the bursa of the female. The degree of spining in the distal part of the bursa also varies. In pseudotibialis the octavals are strong, with prominent apodemes, more so than in tibialis, but not as long as in lophopus where the octavals are very slender. The saccular zone of the valve is expanded, angular as in tibialis, but the saccus is shorter and the octavals less bowed, and not doubled except apically. The aedeagus has a row of moderate, more or less straight cornuti in the vesica. G. tibialis has a single, curved one and lophopus a single straight one. The ductus in the female has a convolute zone that distinguishes it from the other species.

Holotype . SABAH: Mt Kinabalu, Park H.Q., 5500ft 23-24.1.1976, (E.W. Classey), BM geometrid slide 18937.

Paratypes: 1 (slide 19054) NORD BORNEO: Mont Kina Balu, 5.8.1903 (John Waterstradt); 1 (slide 18970) 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.

Geographical range. Borneo, Peninsular Malaysia, (slide 19072), Singapore.

Habitat preference. All Bornean material is from montane localities.

Biology. Yunus & Ho (1980) noted tibialis as feeding on Mangifera (Anacardiaceae) and Hevea (Euphorbiaceae) flowers. Vouchers located in BMNH of both confirmed the first record as being for tibialis but the second (slide 19090) proved to be pseudotibialis.

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