1907] The Spring Migration on the Bruce Peninsula 91 



olive-backed thrush, on the 2 7th, the cedar wax-wing, and on the 

 29th, the olive-sided flycatcher. 



On the first of Jtine the migration was still in full swing, 

 and on that date male black-poll warblers were common, on the 

 3rd I saw the red-eved vireo and the Philadelphia vireo, and on 

 the 6th, the Tennessee warbler, Wilson's warbler, indigo bunting 

 and nighthawk. The migration came to an end on June 8th. 



Species which were more abundant than I have found them 

 elsewhere in spring were the black-poll warbler, bay-breasted 

 warbler, Blackburnian warbler, red-breasted nuthatch, white- 

 crowned sparrow and olive-backed thrush. On five days in 

 May these last-mentioned birds were very common and I took 

 several, while I only secured one grey-cheeked thrush. 



This spring I took three Cape May warblers. Thi^ bird, 

 which was regarded some years ago as very rare, is undoubtedly 

 becoming commoner. I saw seven Philadelphia vireos, more 

 than I have ever observed before during a migration. 



Other interesting things taken were an adult male American 

 redstart with the base of the tail-feathers pale yellow as in the 

 immature male, instead of orange as they should be in the adult 

 male; a male indigo bunting with the back still mostly brown, 

 and a female purple finch, with some pink feathers on the throat, 

 w^hich was singing when taken. 



All warblers were doing far more feeding on the ground 

 and "flv-catching" this year than usual. It is probable that 

 this was caused by the scarcity of insects this spring, the birds 

 having consequently to work far harder than usual for their 

 living. 



In previous vears I have heard the flight-song of the oven- 

 bird only occasionallv, and then usually in the evening. This 

 spring I heard it some eighty times and at all times of the day. 

 Once I saw an oven-bird describe an arc out over the waters of 

 the bay while singing this exquisite song. I saw flocks of pine 

 siskins on May 22nd and 30th and on June 2nd, 5th, 7th and 18th. 

 The flock seen on June 2nd contained about 150 birds. This is 

 unusually late for these birds to be in flocks, as they are as a rule 

 breeding before this. 



In the cedars about the house lived a song sparrow which 

 sang once nearly every night between eleven and two o'clock, 

 and a chipping sparrow which sometimes sang about the same 

 time. 



Some of the results of my work this spring which will be of 

 use to us in making out the movements and distribution of birds 

 in the Great Lake region are: 



