Apparently there are many editions in the LCL, so this is what is in my Euripides Vol III dated 1962:
The Bacchanals
The Children of Hercules
The Phoenician Maidens
Suppliants

The Suppliants (also known as The Suppliant Women, Ancient Greek: Ἱκέτιδες, Hiketides), first performed in 423 BC, is an ancient Greek play by Euripides.

After Oedipus leaves Thebes, his sons fight for control of it. Polyneices lays siege to Thebes against his brother Eteocles. Polyneices has married the daughter of Adrastus, King of Argos. And so Polyneices has on his side the Argive army, leaders of which help form the Seven Against Thebes. The invaders lose the battle, and Polyneices and Eteocles both die. Creon takes power in Thebes and decrees the invaders are not to be buried. The mothers of the dead seek someone to help reverse this, so their sons can be buried.

In Greek mythology, Electra (Greek: Ἠλέκτρα, Ēlektra) was the daughter of King Agamemnon and Queen Clytemnestra,[citation needed] and thus princess of Argos. She and her brother Orestes plotted revenge against their mother Clytemnestra and stepfather Aegisthus for the murder of their father, Agamemnon.
Electra is the main character in two Greek tragedies, Electra by Sophocles and Electra by Euripides, and has inspired other works. In psychology, the Electra complex is also named after her.

Euripides' Electra (Ancient Greek: Ἠλέκτρα, Ēlektra) was a play probably written in the mid 410s BC, likely after 413 BC. It is unclear whether it was first produced before or after Sophocles' version of the Electra story.

Years before, near the start of the Trojan War, the Greek general Agamemnon sacrificed his daughter Iphigeneia in order to appease the goddess Artemis and allow the Greek army to set sail for Troy. His wife Clytemnestra never forgave him, and when he returned from the war ten years later, she and her lover Aegisthus murdered Agamemnon.

A first-rate version of the play exists in a film by Michael Cacoyannis, starring Irene Papas, based on Euripides, it was available on Netflix.
Cf. http://www.imdb.com/title/tt0055950/

Herakles (Ancient Greek: Ἡρακλῆς μαινόμενος, Hēraklēs Mainomenos, also known as Hercules Furens) is an Athenian tragedy by Euripides that was first performed c. 416 BCE. While Herakles is in the underworld obtaining Cerberus for one of his labours, his father Amphitryon, wife Megara, and children are sentenced to death in Thebes by Lycus. Herakles arrives in time to save them, though the goddesses Iris and Madness (personified) cause him to kill his wife and children in a frenzy. It is the second of two surviving tragedies by Euripides where the family of Herakles are suppliants (the first being Herakles' Children). It was first performed at the City Dionysia festival.