Aix sponsa. Aix sponsa. 1873. Maino (Lake Umbagog). Aug. 12. Shot one on Cambridge River about two miles above the dam. " 14. Shot a young bird fully grown, but without wing- feathers, on Cambridge River. " 23 Shot three on Cambridge River. I think they were all adult males, judging by the appearance and color of their bills and feet. Their plumage, however, was near- ly like that of the young male at this season. 1874. At the head of Sept. 15 Sturtevant Pond we started two from the inlet. As they circled past us out of range they occasionally twitched their heads violently, and once or twice nearly stopped in the air, at the same time shaking themselves. I have seen this before. 1880. May 10. A female flying about among the stubs evidently had a nest in the vicinity, for she frequently came overhead showing much anxiety, and reiterating her shrill: o' clark. We saw a pair in the same spot yesterday. " 21. Set A-10 . Fresh--nest in hole in small live elm; standing in water about twenty yards from shore; height about twelve feet. Nest not more than fifteen inches below the entrance; the cavity descending nearly verti- cally. We rapped sharply on the tree without starting the sitting bird. Upon beginning to climb it, however, she came out with great haste, flew off in silence and was not again seen. The eggs were so perfectly covered with the birds down that non one could be seen. June 23. Three or four on Cambridge River above the dam. A young male which I killed was in nearly the plumage of the female. It was shot through the head and as we approached, repeatedly leaped entirely clear of the wa- ter (several feet deep), using its feet alone.