KDixon 1950 Parus gambeli May 28. Boca Spring, 6000 ft., Nevada Co., Calif. Clear, sunny, calm morning. I was in area ± 500 yards N & E of camp in slightly higher elevation. Here forest was more dense with scattered juniper & white Fir trees as well as Jeffrey & Yellow Pine. After 7:30 (ie 1/4 hrs after sunrise) chickadees became more active. Once I heard exchange of the clearly whistled song "chee phe-be" on part of two individuals perhaps 50 feet apart separated by a partial break in the vegetation. Another time, 3 birds in scattered localities were exchanging this song. I was unable to actually see a singing bird to collect it. Once I startled a chickadee which repeated over and over "chicka tica tica tica tica pee peedee" the first phrases run together rapidly. The chickadees in this area were always in pairs and seemed to be located on territories. However none seemed to be nesting and I found no activity such as nest site selection. However Bailey collected a ? with a watery incubation patch. See account of Sitta pygmaea for this date. May 30. Big Spr. Public Camp, ± 9½ mi. S Mono Mills, Mono Co., Calif. I hunted 5:00 - 10:00 AM in forest of tall Jeffrey Pines with Artemisia meadow below. My impression was that nesting was not so far advanced as at Boca - several pairs were seen (but there was little singing "chee - phe-be").