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Hexafrenum muluensis sp. n.
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Hexafrenum muluensis 
(holotype)
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22 mm. Facies as illustrated. The species is very similar to nigricollaris
and apicalis in appearance but the cream subtornal and subapical
patches of the forewing are less distinct and the postmedial is more obvious and
regular; there is a broad black subbasal streak in the centre of the wing; the
patagia are not dark but are speckled with grey.
The male genitalia are also similar to those of the two named species in
having asymmetric subbasal spurs to the valve costa, that on the left valve in muluensis
being very much larger than that on the right. The gnathal processes are
very broad basally as in apicalis and the uncus is of similar size and
shape though the bifurcations are not angled externally. The aedeagus is very
much shorter than in either of the other two species, hardly extending basally
from the apical processes, the ventral of which is short, straight, blunt. The
eighth sternite is only weakly bilobed on the posterior margin whereas in apicalis
it is acutely bifid.
Holotype. SARAWAK: Gunong Mulu Nat. Park, R. G. S. Exped. 1977 - 8 (J. D.
Holloway et al.) Site 1, January, Camp 4, Mulu, 1790 m, 452463, [upper
montane forest], BM notodontid slide 606.
Geographical range. Borneo.
Habitat preference. The only specimen known was taken in upper montane
forest.
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