A swift, powerhouse right to the Jaw knocked out Johnny Bullitt in the 135-pound quarter-finals of the National Amateur Boxing championships at the Boston Garden last night.

The red-headed Dunster House Junior, who won the New Englands last month, took both of his first two rounds from Thomas Larner of Washington, D. C. and was reckoned a cinch to win until the climactic punch in the last 30 seconds of the third and final chapter.

A bye placed Bullitt in the quarter-finals and the English major, who has been University lightweight champion since his Freshman year, was on the short end of the betting at the beginning of his match with Larner.