Cecil Allen Lewellen;302 Main St.;Belle Vernon;died Monday;April 16;1979 at 9:30 a.m.in Mon Valley Hospital;Carroll twp.  She was 69.  Born Feb.28;1910 in Allenport;she was the daughter of the late Charles and Sarah Houseman Allen.  Mrs.Lewellen had lived in Belle Vernon since 1964;having formerly resided in Dunlevy.  She was preceded in death by her husband;Edward Lewellen;Jr.;on Oct.20;1967;and a daughter;Edna Mae Deal in May 1978.  Mrs.Lewellen is survived by two sons;Donald G.Lewellen of Miami;Fla.;and Edward J.Lewellen of Elco;a daughter;Shirley J.Lewellen at home;and two grandchildren. Friends will be received in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon;on Tuesday from 7 to 9 p.m.and Wednesday from 2 to 4 and 7 to 9 p.m.  Funeral services will be held Thursday at 11 a.m.in the funeral home;with Pastor R.Dawson Hopson;of the First United Methodist Church of Belle Vernon;officiating.  Interment will be in Belle Vernon Cemetery.  Shelby D.Ferguson;funeral director;is in charge of arrangements.