Sept. 11, 1961 - "The Lone Ranger," which made "Hi-ho, Silver!" a part of the American vernacular, will be discontinued as a network program after a run of 28 years. The masked rider and his horse Silver, along with the rider's faithful Indian friend Tonto, made their radio debut in 1933 over station WXYZ in Detroit. The radio series was dropped several years ago, but the show has been on various TV networks since 1949. Effective Sept. 23, "The Lone Ranger" will be dropped by NBC-TV, which has been televising it on Saturdays at 11:30 a.m.