1956 Aphelocoma coerulescens Feb. 27 U.C. campus, Berkeley. Heard from paired individuals perching quietly mid-day, or at other times. This performance was more varied and hurried than others I have heard, and included harsh, but not loud notes like the ordinary call note; more nasal and higher pitched than latter. This element, however, was the loudest of those indivi- ded in the vocalization. During the display, the female was foraging over open ground, picking at objects intermittently. Twice she dashed at the displaying male, who however merely veered slightly and continued with the display. After 10 seconds of display, the male stopped; flying away from the female into trees came (50 feet away) and calling 'knk-knk-knk' (normal location note) as he flew. The female continued her foraging on the ground. March! The male on the same territory was noted calling repeatedly, and loudly this afternoon in the manner of an unpaired bird. No other guy was seen near him.