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 1920 J Supplement to the A. 0. U. Check-List. 439 1904. Between August 28 and September 7, 1918, Mr, Robert Moor- croft obtained four, which had been killed or wounded by wires, at the same street corner. He saw many others, during the same few days, and says he has found dead or wounded Robins, at the same place, for some time past. The stomachs were empty in each case, so that the birds are evidently killed during the night or before feeding in the morning. A few high wires pass over a small wooded park at this corner but no definite reason can be given for high Robin mortality at this point. — H. L. 267 Rusholme Road, Toronto, Ontario. 406 Queen St., Ottawa. SEVENTEENTH SUPPLEMENT TO THE AMERICAN ORNITHOLOGISTS' UNION CHECK-LIST OF NORTH AMERICAN BIRDS. The Sixteenth Supplement, the only one since the appearance of the Third (1910) Edition of the American Ornithologists' Un- ion ' Check-List of North American Birds,' was published in July, 1912. Since that time it has for various reasons not been ex- pedient to publish further decisions. The Committee on Nom- enclature, since its reorganization at the A. O. U. meeting in November, 1919, has decided to begin the preparation of a new A. O. U. 'Check-List'. This is undertaken as part of the coopera- tion between the British Ornithologists' Union and the American Ornithologists' Union in the production of a series of lists of the birds of the several zoogeographical regions of the world, and will probably be issued as the Nearctic volume of the proposed ' Sys- tema Avium.' Since the publication of the last A. O. U. ' Check-List' the great activity among xmerican ornithologists has resulted in an almost unbelievable number — several hundreds — of additions and changes most of which have been listed from time to time in 'The Auk' and will have the consideration of the A. O. U T. Committee. As fast as these cases are disposed of, it is planned to publish the decisions in supplements to the 'Check-List,' in order that those who have occasion to use the names of North American birds may have the benefit of the opinions of the Committee.