This document discusses masks used by slaves in New Comedy plays from Pergamon. It references a book on the history of Greek and Roman theater from 1971 that contains figures of the masks on pages 89 and 102. The masks were worn by slaves in plays, possibly including those written by Aristophanes.

3. In BIEBER, M. The History of the Greek and Roman Theater.Princeton:
Princeton University Press, 1971, fig. 316, p. 89.

4. Máscaras de escravos da Comédia Nova. Pérgamo. In BIEBER, M. The History of the
Greek and Roman Theater. Princeton: Princeton University Press, 1971, figs. 389-391, p.
102.

6. Aristófanes ?????