Del. Vincent F. Callahan (R-Fairfax) announced last week he will seek an eighth term in the Virginia House of Delegates. Callahan, who was first elected to the House in 1967, will vie for one of three seats in the newly created 49th District, which includes Falls Church and northeastern Fairfax County.

In addition to Callahan, two Northern Virginia Democrats are expected to announce their candidacies for House seats by the end of this week.

Vivan Watts, a House legislative side, said she will seek the Democratic nomination for one of three seats in the new 51st District, which includes most of the southwest corner of Fairfax County.

Manassas resident Bob Allen said he will vie for the Democratic nomination to one of three seats from the 24th House District, which covers Prince William County and Manassas. Allen, a 33-year old attorney and professor at George Mason University, will be making his first bid for public office.

All three candidates are vying for seats created by the new redistricting plan approved by the General Assembly two months ago. The plan, which has caused considerable controversy, is being challenged by the American Civil Liberties Union, which brings to three the number of court challenges to the plan. Until the court cases are decided, it is unclear what will be the new districts'boundaries. A successful challenge could send the legislature back to the drawing board.

In his most recent term, Callahan, cochairman of the Joint Republican Caucus, was a member of the appropriations and privileges and elections committees. As a member of the elections committee, the 49-year old McLean resident played a prominent role in the reapportionment plan.

Watts, a longtime Fairfax County civic activist, most recently worked as a legislative aide for Del. Dorothy McDiarmid (D-Fairfax). Watts, who two years ago ran unsuccessfully against Fairfax County supervisors' Chairman John F. Herrity, also has been a legislative aide for former U.S. representative Joseph Fisher, also a Democrat.

Watts said she plans to campaign on a platform of full funding of education and improved transportation facilities for Northern Virginia.

Allen, who is on vacation, could not be reached for comment.

Party primaries will be Sept. 8 and the general election Nov. 3.