Three Australian species of the platystomatid genus Microepicausta Hendel, 1914, are identified and keyed. Available information on their distribution and habitat is recorded. Elassogaster terrae-reginae Malloch, 1928, is a new junior synonym of Microepicausta gracilis Hendel, 1914. The following Australian species are described: Microepicausta fenestra sp. nov., Microepicausta wirthi sp. nov.