First Virginia Banks Inc. declared a quarterly dividend of 17 cents per share, payable April 18 to stockholders of record March 31 . . . Solon Automated Services Inc. declared a quarterly dividend of 4 cents per share, payable March 25 to stockholders of record March 11 . . . Richmond, Fredericksburg and Potomac Railroad Co. declared a quarterly dividend of $5.50 per share, payable May 1 to stockholders of record April 1 . . . Security National Corp. declared a quarterly dividend of 35 cents per share, payable March 31 to stockholders of record March 4 . . . International Bank declared a quarterly dividend of 10 cents per share, payable March 31 to stockholders of record March 10 . . . Baltimore Gas and Electric Co. declared a quarterly dividend of 71 cents per share, payable April 1 to stockholders of record March 10 . . . Allied Capital Corp. declared a quarterly dividend of 25 cents per share, payable March 31 to stockholders of record March 18 . . . Farmers and Mechanics National Bank declared a quarterly dividend of 40 cents per share, payable April 1 to stockholders of record March 11 . . . Hazleton Laboratories Corp. declared a dividend of 8 cents per share, payable April 15 to stockhoders of record March 31 . . . Beneficial Corp. declared a quarterly dividend of 50 cents per share, payable March 31 to stockholders of record March 7.