STRUGGLING to contain costs in the face of declining advertising revenues, The New York Times Thursday said it was letting go of 61 Newspaper Guild members, marking the first layoffs for the "newspaper of record" since 1973 . . . ISRAELI TROOPS Friday shot and killed two guerrilla infiltrators during a pre-dawn firefight in the occupied West Bank near the Jordanian border, the military command said . . . RUFUS "FLASH" MCDONALD, a member of the Four Step Brothers tap dancing group that won fame in motion pictures of the 1940s, died Wednesday in St. Louis at age 72.