K Dixon 1950 Oporornis tolmiei Apr. 23. Wildcat Creek, Contra Costa Co., Calif. Sunny, calm morning, 8:30 PM. Tolmie Warbler seen in willows on tributary joining Wildcat Creek E of baseball diamond. A few minutes later a male sang repeatedly from understory vegetation (Plums, willow, Sambucus) of oak woodland at base of north facing slope of hill to south of this creek. Song not melodious, 3 or 4 introductory notes followed by 2 of lower pitch as tsee - - - suh do giving a “clipped off” effect This bird's song was not answered by any other male. Apr. 29. Strawberry Canyon, Alameda Co., Calif. - A singing from several perches circumscribing a diameter of perhaps 50-60 feet along creek, ±100 feet E of SW corner of Botanic Garden. Bird secretive, difficult to observe, singing usually from near top of willow or oak tree, however. This bird believed to have chased silent St. yellow warbler from willow in which it sang at 8:45 AM. Song (repeated at regular, fairly frequent intervals): cheedle cheedle cheedle chee awee see - - ~ - rapid May 3. Singing males appeared to be established in 3 places: one heard on N-facing slope to W of alder-growth along creek (ie: SE of pool); One heard in poison oak - Baccharis - elderberry W-facing slope of 1st draw W of Poultry hab, 9:00 – 10:40 AM and a third in similar growth in next draw W at 10:15. The last 2 sang persistently throughout morning. My impression is that fewer Tolmie Warblers were there in 1947. No PP noted.