Republican Frank Wolf, with nearly $100,000 in contributions from GOP groups and conservative political action committees, has spent nearly twice as much as Democratic incumbent Joseph L. Fisher in the race for Congress from Northern Virginia's 10th District.

In the neighboring 8th District, Republican John F. Herrity, with expenditures through Oct. 23 of $151,438, has spent about one-third more than incumbent Democrat Herbert E. Harris II.

Campaign reports from both races were filed last weekend with the Federal Election Commission.

The reports show Wolf to be the biggest spending congressional candidate in Northern Virginia. He has spent $190,427 while his opponent, Fisher, has spent $97,734.

Most of Fisher's contributions have come from individuals. Political action committees and Democratic groups, which can give up to $5,000 under federal law, have contributed $17,145 out of Fisher's campaign total of $126,546.

According to his campaign report, Fisher has returned $637 in contributions. A Leesburg man who donated $1,000 was given back $500 because the donation exceeded Fisher's own guidelines for campaign gifts. Federal law allows individuals to give $1,000 but Fisher allow them only $500.

Fisher also returned $137 to his administrative assistant John Milliken. "It's not good policy for the congressional staff to give money to the campaign," said Janet Taliaferro, Fisher's campaign cochairmna.

In the 8th District, where bitterness between Herrity and Harris has attracted wide interest, both candidates have invested heavily intelevision advertising for the last week of the campaign.

Herrity, who has spent $51,500 for television commercials this year, has bought $19,000 worth of air time this week. Harris, who has spent $29,000 on television and radio ads, has bought $15,000 worth of radio and television time this week.

Harris, a two-term incumbent, has raised $122,157 according to his report, and has spent $104,271. Out of Harris' campaign receipts, $70,282 has come from individual contributors and $44,399 from political action committees, many of which are connected with organized labor.

Herrity has raised a total of $159,890 this year, with $64,253 of that coming from political action committees and $85,627 from individuals.