Isocossus vandeldeni Roepke,
Isocossus vandeldeni Roepke;
Barlow, 1982: 44, colour illustration.
Diagnosis. 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
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.
to Contents page