BAY-BREASTED WARBLER 



193 



shuns Mexico, the West Indies, and the United States south of Virginia, 

 east of the Allegheny Mountains ; the great bulk passes north through 

 the Mississippi Valley, west to eastern Texas= (Corpus Christi, Port 

 Bolivar), Missouri (Freistatt), and Iowa (Grinnell) ; casual or acci- 

 dental in South Dakota (May 1888), Montana (Big Sandy, May 24, 

 1903), and Alberta (Medicine Hat). 



Spring Migration., — 



The Bird and its Haunts. — Although close observation will reveal 

 the presence of Bay-breasts during both the spring and fall migrations, 

 they are generally to be classed among the rarer Warblers the mere 

 sight of which is stimulating. Occasionally, however, the weather so 

 affects their migration that they come en masse and for a brief 

 period are actually abundant. On the morning of May 27, 1872, 



