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Arctornis lumulosa Mackey comb. n. 
Redoa lumulosa Mackey, 1984: 8.

Arctornis lumulosa

The forewings are irrorated more finely with a duller brown than that of micacea that is not stronger along the fringes and is reduced in a large, lens- shaped area along the costa. There is a conspicuous lunulate black discal mark. The hindwing is irrorated brown in a zone around the tornal angle.

Taxonomic note. Mackey (1984) was not clear whether this name had ever been published by Toxopeus: it also occurs under an apparent manuscript name, lunulata Toxopeus, in the BMNH collection, and was not published by Toxopeus (1948). The description of Mackey is therefore the first, and includes data of a male specimen that must now be considered the holotype of lumulosa Mackey.

Geographical range. Borneo.

Habitat preference. This is a lowland dipterocarp forest species. Three males were taken at 300m in the Ulu Temburong of Brunei, and a female has been taken at 150m on the lowest slopes of G. Mulu.

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