Lagomorpha from the Proto-Orange deposits at Arrisdrift are assigned to the genus Austrolagomys. Better samples of this genus from the type locality, Elisabethfeld, reveal that it is similar to Kenyalagomys, the perceived differences between the genera being due to damage to the material available to Stromer (1926). Kenyalagomys MacInnes, 1953, is thus a synonym of Austrolagomys Stromer, 1926. The Arrisdrift specimens are assigned to a new species of Austrolagomys.