`An unrecorded occurrence of a probable Redflanked Bluetail in Lincolnshire.В­В­The extract quoted below is from page 82 of the typescript of an as yet unpublished book by the late G. H. Caton Haigh entitled "Birds of a Lincolnshire Parish being A List of the Birds of North Cotes with Notes on the Autumn Migration". `Blue-tailed Warbler On September 19th, 20th and 21st, 1903, there occurred one of the greatest mass migrations of small birds that has taken place in the last half century. Redstarts were far the most abundant but Pied Flycatchers, Robins, Willow Wrens, Goldcrests and Wheatears swarmed and a few Bluethroats were present. When beating the hedge running along the land side of the sea bank my keeper (F. Bacon), who was on one side of the hedge, stopped me saying: "On the hedge in front of me is the prettiest bird I have ever seen." Asked to describe it he said "It is like a large Redstart with the red parts blue." All his attempts to make the bird fly to my side of the hedge failed and after making several short flights along the opposite side it flew inland and could not be found again though searched for carefully on three days. I had several short views of this bird as it passed low in thin parts of the hedge but had no chance of shooting it. The keeper's description seemed to me to be correct. The head and upper back and wings were bluish-grey, the