This authoritative new edition of the ancient scholia to Sophocles' Electra is designed to replace the corresponding part of the Teubner text published in 1888. It is the first to rely on a complete scrutiny of the sources of the text and the conjectural activity of scholars, but is also characterised by a fresh methodological approach: the transmission of scholia is prone to creating different versions of basically the same material, and to making conflations of originally distinct entities; in the English preface these transmissional peculiarities guide the editor in establishing a methodology which is appropriate both for analysing the manuscript tradition and composing the critical