WASHINGTON  The director of the Central Intelligence Agency, Leon E. Panetta, has told the House Intelligence Committee in closed-door testimony that the C.I.A. concealed “significant actions” from Congress from 2001 until late last month, seven Democratic committee members said.

In a June 26 letter to Mr. Panetta discussing his testimony, Democrats said that the agency had “misled members” of Congress for eight years about the classified matters, which the letter did not disclose. “This is similar to other deceptions of which we are aware from other recent periods,” said the letter, made public late Wednesday by Representative Rush D. Holt, Democrat of New Jersey, one of the signers.

In an interview, Mr. Holt declined to reveal the nature of the C.I.A.’s alleged deceptions,. But he said, “We wouldn’t be doing this over a trivial matter.”

The chairman of the House Intelligence Committee, Representative Silvestre Reyes, Democrat of Texas, referred to Mr. Panetta’s disclosure in a letter to the committee’s ranking Republican, Representative Peter Hoekstra of Michigan, Congressional Quarterly reported on Wednesday. Mr. Reyes wrote that the committee “has been misled, has not been provided full and complete notifications, and (in at least one occasion) was affirmatively lied to.”