iS XI 1 Loomis on Birds of Chester County, South Carolina. 2 J 



cessive waves every year as to lead to such a result, particularly 

 in species in the southward migration, like the Canadian 

 Warbler, having a breeding range similar to that of others 

 occurring regularly, as the Black-throated Blue and Blackbur- 

 nian Warblers. On the other hand, there might easily be a 

 shifting of the line of migration to the eastward or westward. 

 This is exemplified in the Bobolink, which is abundant along 

 the South Carolina coast in autumn, but only so in the interior 

 of the State in spring. Of birds breeding in the mountains to 

 the northward — habitually rare or absent here in the southward 

 migration — the case might be somewhat different, for the first 

 migratory movement might take them to the region below, 

 stragglers only dropping by the way. The failure of northern 

 born representatives of species like the Rose-breasted Grosbeak 

 and Canadian Warbler to appear later, regularly here or in the 

 country below the fall-line in this State and North Carolina, con- 

 sidered in connection with the fact of the habitual occurrence of 

 other species breeding in the mountains, tends, however, to 

 prove that a more westerly route is pursued in such instances, 

 the trend of the mountains probably being followed, only the 

 outskirts of movements reaching the Piedmont Region. In 

 spring, in the northward migration, the Rose-breasted Grosbeak 

 and Canadian Warbler apparently bear further to the eastward 

 bringing this locality more in their path. The abundance of the 

 Blackburnian and Palm Warblers in autumn, like the scarcity of 

 the Bobolink, is also seemingly attributable to deflection to the 

 eastward. 



It does not follow because absence or rarity in successive years 

 through the whole course of a migration may be due to shifting 

 of route that waves may not pass directly over a locality without 

 their being manifested through the stopping of the birds. Such 

 a phenomenon in actual occurrence was witnessed by me at 

 Monterey Bay, California, during August, 1S92. An extensive 

 movement of Northern Phalaropes took place during the first 

 week of the month. The height of the movement was during 

 the forenoon of the second day, when there was a continual suc- 

 cession of flocks moving rapidly down the coast. They flew 

 but a few feet above the water, following the shore-line of the 

 Bay, rounding Point Pinos, and heading steadily southward. 



