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Monocerotesa proximesta sp. n.  

Monocerotesa proximesta (paratype)

9-10mm. This is the sister-species to the Balinese M. hypomesta Prout, resembling it closely in facies and differing from minuta as described above. It shares with hypomesta a number of genitalic features: two irregular digitate processes from the apex of the short aedeagus (these are much shorter in hypomesta, and such processes are also seen in the most easterly species in the genus); a triangular uncus without accessory processes (longer, more slender and tapering in proximesta); a broad costa and cucullus to the valve (the latter more setose in proximesta); a broad, roughly triangular field of peg-like setae in the centre of the valve; a very weak saccular spur. The Bornean species is additionally distinguished by a slender setose spur extending ventrally from the cucullus, between it and the central setation.

Holotype . SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Site 13, February, Camp 2, Mulu, 500m, 401464, mixed dipt. for., BM geometrid slide 12704.

Paratypes: 2 (slide 16355), 1 (slide 16467) as holotype; 13  general data as holotype but from Sites 8, 14, 15, 20, 23, 24, 25.

Geographical range. Borneo.

Habitat preference. Much commoner than minuta, proximesta is frequent in a range of lowland forest types and has also been recorded from lower montane forest. It has been taken in heath forest but showed some preference for forest on limestone during the Mulu survey.

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