192 CALIFORNIA ACADEMY OF SCIENCES. 



down the coast as on the 30th, but not in such large num- 

 bers. There were some young ones among them. With 

 the exception of a single trio, two adults and a young 

 bird, the Murrelets flew in couples. There was some 

 migration of California Murres, but not nearly as much 

 as on the 30th. After the fog cleared away there ap- 

 peared to be a decided migratory movement southward of 

 Heermann's Gulls, small bands passing down the coast 

 in frequent succession. They flew near the shore and 

 rather high in the air. There was a directness and 

 steadiness of flight not observed before. They appeared 

 to be bent upon a journey, not merely going and coming 

 from feeding grounds. As already stated, previous in- 

 dications of migration in this Gull had been manifested 

 solely by increased abundance, particularly noticeable in 

 the adults. Four Pomarine Jaegers were seen after the 

 fog. They followed the same path of movement as the 

 Heermann's Gulls. A solitary Cassin's Auklet was taken. 

 It was a female, apparently a breeding bird of the season. 

 This species had not been noted before during the sum- 

 mer. 



Western Gulls gained in numbers during the month in- 

 stead of diminishing as they appeared to do in July, 1892. 

 The great increase in Heermann's Gulls, however, ren- 

 dered them less prominent. 



From the above detailed account, it will be seen that 

 increase in abundance in some species of summer and 

 extensive migratory waves in others, followed by intervals 

 of scarcity, and the appearance of boreal species, were 

 the chief features of migration in July. 



Excluding the Scoters and Black Turnstone, the north- 

 ern birds to appear were Rodgers's Fulmar, Harlequin 

 Duck, Marbled Murrelet, Northern Phalarope, Pomarine 

 Jaeger; all except the last one appearing during the first 

 half of the month. 



