A woman who faces charges in Maryland in the abduction of her infant son from a foster home has been arrested by the FBI in San Diego and is expected to be returned to the East Coast by tomorrow, the FBI said yesterday.

Joyce Anne Klipa, 28, was jailed in San Diego after her arrest Thursday night at Lindbergh Field International Airport in that city, according to FBI spokesman Gary Laturno.

Klipa is wanted on state kidnaping charges in Maryland in the abduction of a social worker April 21 and the subsequent abduction of her 9-month-old son Zachary from an Anne Arundel County foster home. The social worker was released.

Neither the baby nor his father, William Thomas Forrer, 32, who also is charged with kidnaping, has been found, the FBI said.

Laturno said Klipa had called the FBI from a motel Thursday and said she was wanted by the FBI and was ready to be taken into custody.

"But when we went to take her into custody, we found she had checked out and gone to the airport," Laturno said. She was boarding a flight to Baltimore when apprehended, he said.

The charge placed against her in San Diego is contempt of a federal court in Harrisburg, Pa., where she allegedly failed to appear before a grand jury investigating whether she had given refuge to her husband after an incident at Baltimore-Washington International Airport in February.

On Feb. 21, Forrer, a suspected drug courier who is wanted for escape from prison, left Zachary and a diaper bag containing $35,000 on an airplane at the airport, police said

Anne Arundel County police spokesman Richard Molloy said Forrer fled from the Florida-bound jetliner after he realized he was under police surveillance. Molloy alleged that Forrer left three bags of marijuana in the airplane restroom and, pursued by state troopers, ran through the terminal, stole an airport van and escaped.

The baby was turned over to the Anne Arundel Protective Services Department and then placed with a foster family. The child was abducted from that home April 21, police said.