Ethel Barrymore Colt, 65, daughter of the late Ethel Barrymore and an actress and singer in her own right, died Sunday in New York City.

A member of the ninth generation of the famous acting family, she had found it difficult in her earlier years to make good because of her name.

Her first stage role came at the age of 18, when she appeared with her mother in "Scarlet Sister Mary." The critics were not kind to her. She felt they expected too much of her.

Miss Colt then toured the country, playing one-night stands for five years in order to learn stagecraft and acting. At one point, she even used an alias, Louisa Kinlock, to be sure the plaudits she was receiving were for her own ability and not because she was a Barrymore.

She proved herself a versatile and talented singer, actress and producer, playing dramatic roles on Broadway and in summer stock and singing in grand opera, operetta, musical comedy and on the concert stage.

She made her operetta debut in 1944, singing the lead in a New York City Center production of "Martha." She gave concerts in this country and abroad and appeared in Washington with her mother at the National Theater. She also had sung with the Washington Opera Company.

Miss Colt, however, considered her greatest accomplishment to be her lasting marriage to petroleum and mining executive John Romeo Miglietta.

They were married during World War II. In addition to pursuing her career, she devoted much of her time to being a wife and a mother to their son, John Miglietta, now an actor. Her husband died in 1975.

In an interview with The Washington Post in 1968, Miss Colt said of her mother:

"She was the greatest woman I ever knew, nine times bigger than life."

Miss Colt added that she was proud of what she had accomplished, whether because of or despite Ethel Barrymore's huge shadow.

She also said her uncle, the late Lionel Barrymore, appeared to be a "misanthrope" who had "very few human contacts."

Of her other uncle, the late John Barrymore, she added: "He was terribly human, outgoing, witty and gay. As an actor, Uncle Jack was always ahead of his time, a symbol of modernism."