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Pseuderosia desmierdechenoni sp. n.  

Pseuderosia desmierdechenoni (paratype)

15-16mm. This species is medium to dark grey, rather than warm buff, but its markings are very similar to those of cristata. The forewing postmedial is more angled at one third from the costa, and the pale, yellow-orange highlights of the fasciation are reduced relative to those of cristata. In the male abdomen the coremata between segments 5 and 6 are very massive. The uncus is much less deeply bifid than in cristata, the valves less downturned, with a ventral spur. There is a long spine arising from the anellus. The aedeagus is longer, with a shorter blade-like process at the apex.

Holotype. l BRUNEI: 450m, Ulu Temburong, rainforest 28.4.81 (Lt. Col. M.G. Allen); BM drepanid slide 2100.

Paratypes: 1 as holotype but 300m, 10.2.80; 1 BRUNEI: 130m, Labi primary forest and secondary veg. 12.1.1980 (R. Fairclough).

Geographical range. Sundaland.

Habitat preference. Bornean specimens are all from lowland forest.

Biology. The species has been reared from oil palm (Elaeis) in Sumatra (R. Desmier de Chenon, pers. comm.).

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