September 22, 1982

An off-duty correction officer described today how he captured Kathy Boudin at a roadblock after last year's Brink's robbery and murders in Rockland County, and how she told him that others did the shooting. The officer, Michael Koch, said he heard shots and saw Miss Boudin running across from him on the shoulder of the Gov. Thomas E. Dewey Thruway. ''I grabbed her and she said: 'I didn't shoot him, he did. He shot him, I didn't shoot him.' '' The person who did the shooting was not otherwise identified.

Trading accusations of opportunism, Lieut. Gov. Mario M. Cuomo and Mayor Koch yesterday held their final debate before Democratic voters nominate one of them for Governor. ''Before he was caught up by political temptation,'' said Mr. Cuomo, with a curt nod toward his opponent, Mr. Koch admitted he ''has not done the job in New York.'' The Mayor in turn accused Mr. Cuomo, who will be on the Liberal Party line in the general election, of looking for an excuse ''not to abide by the primary'' and support the winner. ''I happen to be the candidate who will win the primary,'' Mr. Koch said. Then, turning to Mr. Cuomo, he asked, ''Is your ambition more important than having a Democratic Governor?''

The people who live in the 12-story red-brick building at 62-64 Seventh Avenue here talk freely of its squalor and perils. But the briefing is unnecessary, for the specter of this place is such that those who visit for the first time shrink at the sight of it. In a lobby of dark corners, an elevator waits. It too is lightless. The passengers, straddling a runnel of urine, make their ascent. The cab stops, the door opens, the hallway air is thick and fetid. Here, next to an apartment, is a sprawling mound of empty containers, meat scraps and rotting vegetables. Beyond the pile, the corridor floor is black and viscous, covered with years of detritus and neglect. Building 62-64 and nine others like it make up the Columbus Homes project, one of 26 complexes in Newark's stock of public housing.

Brazilians have always been frustrated by the habit some foreigners have of confusing this vast country with others on the continent, but the lament has now taken on a particular urgency in the financial community. With an economy highly dependent on continuing investor confidence from abroad, bankers, businessmen and Government leaders complain that the debt crises in Mexico and Argentina are seriously undermining Brazil's capacity to address its own balance of payments problems. They are making it their principal order of business to convince foreign lenders not to tighten the purse strings, that Brazil, the world's eighth-largest economy, deserves treatment that is distinct and more favorable. ''You know how people are always thinking that Buenos Aires is the capital of Brazil and so on,'' said Peter P. Schmid, the representative of Credit Suisse in Rio de Janeiro. ''Brazil right now is suffering from this generalization, and it is jeopardizing a selling and marketing effort that Brazil has conducted for years.''

Federal District Judge Joseph H. Young said today that he would probably not interfere with the Martin Marietta Corporation's plans to purchase a 50.3 percent controlling interest in the Bendix Corporation after midnight Wednesday at a price of nearly $900 million in cash. A few hours after Judge Young's statement, Bendix announced that it had postponed until Monday a special stockholders meeting called to seek shareholder approval of two antitakeover amendments to Bendix's charter. The meeting had been scheduled for Wednesday morning. Bendix apparently postponed it in an effort to convince Marietta to delay its purchase of a controlling interest in Bendix until after the vote on the amendments, which could hamper the Marietta takeover. Executives of both companies met for several hours in what sources said may be an attempt to work out an agreement. (Page D4.)