Mildred Kostella;63;of Perryopolis R.D.2;Jefferson Township;died Tuesday;June 8;1993;at 2:05 a.m.in Mon Valley Hospital;Carroll Township. She was born Oct.14;1929;in Belle Vernon;a daughter of the late Hobart and Nina Caruthers Clegg. A former Belle Vernon resident;she had lived in the Perryopolis area since 1956. A homemaker;she was preceded in death by her husband;Robert B.Kostella;on Jan.31;1982. Survivors include two sons;Robert W.Kostella of Belle Vernon and Mark David Kostella of Madison;one brother;Carl Clegg of Belle Vernon;and two grandchildren;Melissa and Joel. Friends will be received Wednesday from 2 to 4 and 7 to 9 p.m.in the Ferguson Funeral Home Inc.;700 Broad Ave.;Belle Vernon;where services will be held Thursday at 11 a.m.with the Rev.James Burton;pastor of the First Presbyterian Church of Belle Vernon;officiating. Burial will be in Belle Vernon Cemetery. The Ferguson Funeral Home Inc.is in charge of arrangements.