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Hexafrenum austrocollaris sp. n.  

Hexafrenum austrocollaris (paratype)

23 mm. The facies is as illustrated, very similar to that of the Himalayan collaris Swinhoe and distinguished from other Bornean species by the more prominent subapical cream area of the forewing and the similarly coloured zone extending the length of the dorsum. The thorax is a similar cream colour though the patagia are more pale grey as in collaris. The species is best distinguished by the male genitalia where there is a lobed process arising from the centre of the valve and the lower process from the aedeagus apex is much longer then the upper and distinctively curved. The eighth sternite is bilobed, the lobes separated by a deep triangular cleft.

 SARAWAK: Gunong Mulu Nat. Park, R. G. S. Exped. 1977 - 8 (J. D. Holloway et al.) Site 11, February, Camp 1 Mulu, 150 m, 385470, mixed dipterocarp forest/river, BM notodontid slide 607.

SARAWAK: general data as holotype, 1 Site 13, 500 m, Camp 2, Mulu, 401464, mixed dipt. for., 2 Site 21, 130 m, W. Melinau Gorge, 423576, alluvial/kerangas bank, BM notodontid slide 605; 3 BRUNEI: Temburong, L. P. 298, 300 m, 7. x. 1978 (T. W. Harman).

Geographical range.
Borneo, Sumatra.

Habitat preference.
This would appear to be a rare species in mixed dipterocarp forest.

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