Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Themisto

（Θεμιστώ). The third wife of Athamas (q.v.), who married her under the impression that his wife Ino was dead. When he heard, however, that Ino was living as a votary of Dionysus, in the ravines of Parnassus, he secretly sent for her. Themisto, on hearing this, determined, in revenge, to kill Ino's children, and ordered a slave, who had lately come to the house, to dress her children in white and Ino's in black, so that she might be able to distinguish them in the night. But the slave, who was Ino herself, suspecting the evil intention, exchanged the clothes. Themisto, in consequence, killed her own children, and, on becoming aware of her mistake, slew herself also.