Mountelgonia abercornensis is a moth of the family Cossidae. It is found in north-eastern Zambia. The habitat consists of woodland mosaic at high elevations.

The wingspan is about 25 mm.

The species is named after the type locality of Abercorn (now Mbala, Zambia).Lehmann, 2013. Description of two new genera and ten new species of Metarbelidae (Lepidoptera: Cossoidea) from western, north-central and eastern Africa with notes on habitats and biogeography.

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