Mentioning something by saying you aren't going to mention it (e.g., "I won't mention his laziness") is called "apophasis" or "preterition". Joseph Shipley's Dictionary of World Literary Terms (The Writer, 3rd ed., 1970) says: "~apophasis~ Seeming to deny what is really affirmed. Feigning to pass by it while really stressing it" (e.g., "not to mention his laziness"): paralepsis. Touching on it casually: metastasis. Pretending to shield or conceal while really displaying (as Antony with Caesar's will in Shakespeare's play): parasiopesis. ... ~autoclesis~ (P. the self-inviter). Introduction of an idea by refusing before being requested, intending thus to awaken (and respond to) a demand, as Antony with the will in Julius Caesar." "Paralepsis" is more often spelled "paraleipsis" (which is the Greek form) or "paralipsis". A few sources (such as The Century Dictionary, and the Universal English Dictionary by Henry Cecil Wyld) do not support a distinction between apophasis and paraleipsis.
