417 Gilmore 1931 RED BREASTED AMERICAN MERGANSER. Mergus serrator May 31 Uralaska Bay- Uralaska, Alaska Quite a number of these birds present. Found on lakes, along shore & in marshy ground. Beginning to lay - one fully formed egg taken from 7. Pairs flocks of up to 6 seen. Sometimes sit on gravel of shore line. More noticed at Broad Bay Marsh than elsewhere. Sept. 19 Uralaska, Uralaska Is., Aleutians, Alaska. I saw a bunch of 6-7 on Tuck Lagoon back of Summers Bay this afternoon. All appeared to be females or immatures. They were loafing in shallow water near shore and seemed almost stupidly indifferent to my approach. Oct. 3 English Bay N. Uralaska Is., N. Aleutian Is. A flock of 5 birds hiring around the rocky north shore of the bay, and seemed loath to leave even after I had scared them up twice. They were quite wary and as they flew the white speculumes and reddish heads were conspicuous.