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Cossus retak sp. n.
 22mm.
This species is as large as vandeldeni and has the ventral anterior of
the prothorax dark as in that species, but both patagia and tegulae are darker
than the pale cream-yellow centre of the thorax, rather than just the tegulae.
There is a pair of dark brown spots dorsally at the base of the abdomen. The
forewing ground colour is white, heavily blotched and reticulated with dark grey
as illustrated, with some entire but irregular transverse striae towards the
margin.
The male genitalia have the uncus narrow relative to the tegumen,
tapering slightly to a rounded apex. The bulla is deep. The valve is apically
biangular, upcurved, without distal ornament. The basal spine is robust.
Holotype
BRUNEI: 1619m, Bukit
Retak, montane forest, 14.9.1979 (Lt. Col. M. G. Allen) BM
cossid slide 131.
Geographical range. Borneo.
Habitat preference. The only specimen is from upper montane forest.
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