From Norfolk and Portsmouth.
--Parties who reached Petersburg Wednesday, brought information direct from Portsmouth and Suffolk. A large negro force is being concentrated at Portsmouth.--There are now there about three thousand negro infantry, besides a battalion of mounted men. It is supposed that a raid is contemplated towards the Blackwater.No Yankees have recently visited Suffolk, but the pickets are still at Jericho Run, two miles below town, and a camp of cavalry is kept up at Bernard's Mill.