Waltham - Mrs. Maria Clara C. de Millarengo, of Waltham, passed on Tuesday, February 17, 2009 at Maristhill Nursing Home in Waltham. Born in Buenos Aires, Argentina, a daughter of the late Jose and Carmen (Torres) Costa, Clara had lived in Waltham and in Lawrence for several years. She enjoyed knitting and crocheting. Clara was the wife of the late Antonio Millarengo. She leaves a daughter, Nelly, of Waltham; a son, Roberto and his wife, Haydee, of Buenos Aires; her sister, Elsa Caballero of Buenos Aires; one granddaughter, Marisa Millarengo Duhalde and her husband, Julian; three great-grandchildren, Tomas, Camila, and Joacquin and many nieces and nephews. Funeral services and cremation will be private. Memorial donations may be made to The German Home, 374 Howard Street, Lawrence, MA 01841.