There is not a play called "Iphihenia in Trachis" you might be confusing

Women of Trachis an Athenian tragedy by Sophocles with Iphigenia in Tauris a drama by the playwright Euripides.

There is no Iphigenia in Trachis; you might mean Women of Trachis by Sophocles.

Or:

Iphigenia in Tauris(Ancient Greek: Ἰφιγένεια ἐν Ταύροις, Iphigeneia en Taurois) is a drama by the playwright Euripides, written between 414 BC and 412 BC. It has much in common with another of Euripides's plays, Helen, as well as the lost play Andromeda, and is often described as a romance, a melodrama, a tragi-comedy or an escape play.