CALIFORNIA WATER BIRDS. 207 



Pomarine and Parasitic Jaegers, on the 22d and 23d. 



Red Phalarope, on the 27th, probably beginning on 

 Sunday, the 26th. 



The Western and Heermann's Gulls have been omitted 

 from the list, as their fluctuations in abundance were not 

 closely followed at the last. 



Sumtnary. — As has been shown by the facts presented, 

 early southward migration was indicated by increased 

 abundance in certain " summer species," by the appear- 

 ance of species not previously observed, and by the 

 passage of migratory waves, the birds being seen actually 

 in transitu. As early as the latter half of June the tide 

 of migration apparently began to set southward, migratory 

 waves seemingly occurring in the California Murre and 

 Dark-bodied Shearwater. During the first fortnight of 

 July northern birds began to appear, the Northern Phala- 

 rope being the most notable example. There were ex- 

 tensive waves of " summer species," particularly during 

 the latter part of the month. The closing days were 

 signalized by conspicuous waves in the Marbled Murrelet 

 and Northern Phalarope, and by the advent of the Pom- 

 arine Jaeger. During August the waves assumed much 

 larger proportions and increased in frequency. Boreal 

 birds became prominent, the waves of the Northern 

 Phalaropes from the outset rivalling those of species 

 summering in the region. The Sabine's Gulls, the Arctic 

 Terns, and the wave of Red Phalaropes, appearing to- 

 ward the close of the month, foreshadowed the great au- 

 tumnal migrations that were to follow, as the Pomarine 

 Jaeger, Marbled Murrelet, and Northern Phalarope, at the 

 end of July, foreshadowed the movements of August. 



While the general tendency was toward increase in size 

 of the waves as the migrations advanced in a species, 

 lesser waves also intervened between larger ones. Small 



