1948 anas acuta 1 Oct.24. San Pablo Reservoir, 300+ ft., Contra Costa Co., Calif. Three more or less separate flocks totalling an estimated 1200 birds. The two largest flocks were mostly resting on the far (N.E.) shore of the lake, while about 100 or so were feeding in shallow end together with baldpats & teal. Nearly all the males seem to have pretty well come out of the eclipse plumage & their white breasts now show up prominently from a distance. Oct.31. Bay Farm Id., Alameda, Alameda Co., Calif. one female which circled us on SW shore of San Leandro Bay uttered low, very hoarse "quack" several times. It was even less musical than a mallard's reedy note. 1949 Feb.5. 4¼ mi. W of Thornton, northwestern San Joaquin Co., Calif. - a single huge mass of 20,000 or so (as estimated by flocks of 50 for 1st 500, then by 500's) densely packed on a partially flooded plowed field by N. fork of Mokelumne River. They were feeding voraciously in the mud, both in & out of the water, the "white" breasts of the males being a good mud-brown dark color. We looked them over carefully for other species, but saw none (the one "mallard" quack was heard). This flock