350 CALIFORNIA ACADEMY OF SCIEISrCES. [Proc. 3D Ser, 



I, Migration. 

 Summary of Movements. 



Bird Waves. — While there were fluctuations seemingly- 

 due to migration in most of the species observed, extensive 

 movements to breeding grounds occurred only in the 

 Loons, Bonaparte's Gull, Forster's Tern, and Northern 

 Phalarope. 



Loons. At the time of my arrival a bird wave was appar- 

 ently receding. It appeared to be composed chiefly of the 

 three species of Loons. For several days they were numer- 

 ous on the water and on May 3 there was an extensive 

 northward flight, which expended its strength on the fol- 

 lowing day. By the 5th few were to be found anywhere. 



May 12 there was a great passage of Loons in companies 

 upon the ocean — the Pacific Loon apparently predominat- 

 ing. It was foreshadowed by a considerable movement on 

 the nth and was followed by a period of little activity from 

 the 14th to the 19th. On the 19th and 20th many solitary 

 ones passed north. Then for nearly a week little move- 

 ment took place and stragglers increased on the water. 



May 27 there was a large flight of black-throated Loons, 

 mainly G. facijica. As on the 12th, they flew in bands and 

 passed Point Pinos without entering Monterey Bay. By 

 the 29th this flight had subsided. Afterwards no extensive 

 migratory movement was witnessed, although stragglers 

 were observed to the end of my stay. 



Bonaparte's Gull. On May lo a migratory movement 

 began in Bonaparte's Gulls which reached its height on the 

 14th and 17th, when they were abundant. After the i8th 

 only stragglers were encountered. 



Forster's Tern. These Terns were plentiful from 

 May II to May 14; afterwards none were seen. 



Northern Phalarope. From the nth to the 14th of 

 May there was a great inroad of Northern Phalaropes. 

 They departed suddenly, from the 15th onward a few lag- 

 gards only being met with — the last, June 5. 



