124 TIIK WILSON BULLETON No. G4. 



beginning with the Solitary Sandpiper the end of the first week 

 in July. -By the middle of the month the Yellow Warblers be- 

 gin to thin out. With us at Detroit this is all the migration 

 phenomena we observe until the end of August when the first 

 of the warblers arrive. Any increase in the number of birds 

 previous to this date is generally ascribed to their greater activ- 

 ity after their nidification duties are over. At Pelee, however, it 

 is evident that by the middle of August several species of land 

 birds have come down from further north. Aug. 15-16, 1908, 

 the following migrants of this class were present. 



Kingbird, gathering and already in usual numbers. 



Olive-sided Flycatcher. two. 



Wood Pewee. in large numbers. 



Bobolink. Passing down the Point in flocks of five hundred 

 daily. 



Purple Martin. large flock. 



Barn Swallow 1 



Bank Swallow In large flocks and passing out 



Tree Swallow towards the end of the Point. 



Rough-winged Swallow 



Black and white Warbler. several daily. 



Water-Thrush. One. 



Prairie Warbler. One taken. 



Mourning Warbler. One taken. 



Canadian Warbler. Several. 



That these early dates indicate earlier migrations at Pelee 

 than elsewhere we do not believe. In other localities a few or 

 even many of the above species, spread over a broad front 

 could and probably would pass through unobserved. Here it is 

 different ; the conformation of the land brings these earliest few 

 migrants to a small focus, where observation of them is easier. 



The presence of the above species in late summer is hardly 

 less interesting than the absence of others at the same time. 

 The Northern Yellow-throat is common during the spring 

 months but is scarce in late August or absent altogether. We 

 observed none Aug. 15, 1908, or from the 24th on in 1907. 

 Early September usually brings in great numbers again. Con- 

 sulting our S. E. Michigan data we should say that there was 



