Valentina and Leonid Koslov will replace Natalia Makarova and George de la Pen a in the final weeks of the Kennedy Center production of "On Your Toes," the center said yesterday. An earlier announcement from the center, reported in Tuesday's Style section, had said the replacements would be Galina and Valery Panov.

Natalia Makarova has been signed to play the role of the temperamental Russian ballerina in the Kennedy Center's revival of Rodgers and Hart's "On Your Toes," the center's chairman, Roger L. Stevens, said yesterday.

Makarova, a principal with the American Ballet Theatre, will be the star for four of the musical's six weeks in Washington; it is tentatively scheduled to debut Dec. 11, Stevens said. In the role of her pompous Russian partner will be dancer George de la Pen a, formerly of ABT.

During the other weeks of the Washington run, the two Russian dancers will be performed by Valery and Galina Panov, Stevens said, because Makarova has unbreakable engagements in Europe.

"On Your Toes," which dates from 1936, is the story of a beleaguered Russian ballet company that is bailed out by an American upstart who creates a jazz ballet -- George Balanchine's "Slaughter on Tenth Avenue." This revival of the show, originally scheduled for the Eisenhower Theater, is being transferred to the larger Opera House, which was left available during the period by cancellation of the American Ballet Theater season. ABT is in the ninth week of a lockout.

Makarova will rejoin "On Your Toes" for an open-ended Broadway run in February, Stevens said.

Makarova and the Panovs are themselves Russian dancers who immigrated to the West.

George Irving will take the role of the Russian ballet company's impresario in "On Your Toes." The other female lead has been offered to Betty Comden, Stevens said.

The only major role left uncast is Ray Bolger's old part as the American choreographer.

The revival will be staged by the two men who did the original in 1936, director George Abbott, 95, and Balanchine, 78. Stevens said Balanchine, who was hospitalized here during his New York City Ballet's recent two-week appearance, is recovering well. "If he needs assistance, Peter Martins will step in," Stevens said. Martins is a principal dancer and choreographer at the City Ballet and is regarded by many as Balanchine's heir apparent.