The head of a Senate panel investigating Clarence Thomas said Monday that the Supreme Court justice had failed to disclose additional private jet travel.

In a letter to an attorney for conservative megadonor Harlan Crow, Sen. Ron Wyden, D-Ore., said flight records show that in 2010 Thomas and his wife traveled round-trip from Hawaii to New Zealand aboard Crow’s private jet.

Wyden, who chairs the Senate Finance Committee, said the finding intensified his concerns that Crow was engaged in a…