CALLISTRATUS, Alexandrian grammarian, flourished at the beginning of the 2nd century B.c. He was one of the pupils of Aristophanes of Byzantium. Callistratus wrote commentaries on Greek poets, a few fragments of which have been preserved in the scholia and in Athenaeus. He was also the author of a miscella neous work called Zvgiu rti, used by the later lexicographers, and of a treatise on courtesans (Athenaeus iii. 125 B, xiii. S91 D) . He is not to be confused with Callistratus, the pupil and successor of Isocrates and author of a history of Heraclea in Pontus.