The Editorial Board of Renaissance Quarterly is most kindly continuing its tradition in Renaissance News by allowing me to publish the third supplement to the Catalogue of Italian Plays 1500-1700 in theUniversity of Toronto Library (University of Toronto Press, 1961). Previous supplements appeared in RN16 (1963), 298-307, and 19 (1966), 219-228. The plays listed below illustrate a wide range of theatrical tastes, from Latin and Italian passion plays, medieval in tradition, to the later dominant vogue for musical dramas. In editions of the latter it became customary early in the seventeenth century to record architects, costumers, and performers, so that the printed plays are a valuable source for stage history. Scenery for four of these dramas was designed by Ferdinando and Francesco Galli di Bibbiena, then at the outset of their careers.