What is the famous Aristotle quote about a mask?

"Comedy is, as we have said, an imitation of characters of a lower type- not, however, in the full sense of the Word bad, the ludicrous being merely a subdivision of the ugly. It consists in some defect or ugliness which is not painful or destructive. To take an obvious example, the comic mask is ugly and distorted, but does not imply pain."

Quote from POETICS, by Aristotle, 350 BC