Mary (Mayme) Riskey of 412 Wood St.;Belle Vernon;died Wednesday;Oct.18;1978; at 6:20 p.m.in the Mon Valley Hospitl;Carroll Twp.  She was 88.  Born in Belle Vernon;Dec.13;1889;she was the daughter of the late Jesse and Mary Brawley Smith. Mrs.Riskey was a former resident of Allenport;and had lived in Belle Vernon the last 15 years.  Mrs.Riskey was a member of the Belle Vernon Church of the Nazarene;and the Belle Vernon American Legion Ladies Auxiliary.  Also;she was a Gold Star Mother.  She was preceded in death by her husband;Stephen Riskey;on Jan.19;1960. Mrs.Riskey is survived by a son;John Riskey of St.Petersburg;Fla.;two daughters;Mrs.John (Thelma) Cavanaugh;with whom she made her home;and Mrs.Margaret Bickerton;also of St.Petersburg;Fla.;five grandchildren; and 15 great-grandchildren.  Friends will be received in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon;from 7 to 9 p.m.Thursday and from 2 to 4 and 7 to 9 p.m.Friday.  Funeral services will be held Saturday at 11 a.m.at the funeral home;with the Rev.Kenneth E.Neiderhiser;pastor of the Belle Vernon Church of the Nazarene;officiating.  Interment will be in Belle Vernon Cemetery.  Shelby D.Ferguson;funeral director;is in charge of arrangements.