The genus Acanthobrama has been redefined to exclude A. terraesanctae Steinitz. This has been made the type of a new genus, Mirogrex, characterized by the high numbers and slender form of the gill-rakers. Two subspecies of M. terraesanctae are recognized and defined and a description is given of a new species of Acanthobrama from the Mediterranean rivers of Israel. The relationships of these genera are discussed.