Cogswell 1948 Amphispiza belli Nov.21 - Ridge 5 of upper Mahube Ranch, 3 & mi. S. & 1+ mi. W. Healeyville, Lake Co., Calif.. In area of chaparral regrown to knee height (after fire 3 yrs ago according to Mr. Mahube) near grassy area on summit of ridge, I was sure I heard the light "tick" call note of this species -- at two different times. But I couldn't get sight of the bird. 1949 Apr.2 - 1+ mi SSW Mt. Diablo Peak, 2300+, Contra Costa Co. Calif. - While engaged in making a transect thru breast high adenostoma- ceanothus chaparral on NE facing slope, we were surrounded by at least 3 birds of this species. Two were singing with slightly less regular "suing" to the songs than I have noted in southern California, a third bird closely associated with one of the singing ones right near us was probably the ? of the pair in whose territory we were crashing thru the brush. Dr. Ritelka says the species has been in this spot for at least the last 5 years. The shrub cover is now at about the same height & density as on our Bouldress study area (1942) near Pasadena -- from which they disappeared upon further growth of shrubs & near closure of the canopy in the next 4 years. Today one called a harsh "zween" several times as well as ordinary "tick" calls.