Abstract
Type specimens have been examined of eleven Australian species of the tetramerous Aphelinidae described by Girault in the genera Apteroptrbc, Metacasca, Neocasca, Oa and Pteroptrixella. Apteroptrix and Oa are synonym‐ized with Archenomus. O. biguttata is considered a nomen dubium. M. copemici is transferred to Neocasca. Dahmsiella genji. is proposed for N. shillingsworthi. Pteroptrixella is suspected of being a senior synonym of Metacasca, but the former genus is represented by an incomplete specimen. A key is given to the tetramerous genera of the Aphelinidae.

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