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Cossus vandeldeni Roepke comb. n. 
Isocossus vandeldeni Roepke, 1957: 11.
Isocossus vandeldeni Roepke; Barlow, 1982: 44, colour illustration.

Cossus vandeldeni

This species and Cossus rufipecten sp. n. are larger than all Bornean congeners except kinabaluensis, males differing from it in the almost uniform finely striate bone grey forewing. A putative female is illustrated (Plate 1), having a diffusely darker zone medially over the costal half of the forewing and a dark brown patch subapically. This and the next species are very similar externally, but can be distinguished by the features noted in the description of the latter.

Taxonomic notes. The justification for excluding this species from Cossus is obscure as the male genitalia appear typical. Therefore Isocossus Roepke is here brought into synonymy with Cossus, syn. n., until its distinctiveness can be tested by a morphological survey of Cossus and allies.

Geographical range. Peninsular Malaysia, Sumatra, Borneo; the Indian subregion localities cited by Barlow (1982) are wrong.

Habitat preference. In Brunei the species has been taken once in lowland forest at Labi. The two females are from Labi and Ulu Temburong.

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