3l8 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Larus glaucescens. Glaucous-winged Gull. — The first 

 one came under observation Oct. 30. By Nov. 12 they were 

 rather common. 



Larus occidentalis. Western Gull. — They were very 

 abundant. Through the passage of migratory waves, some- 

 times the old and sometimes the young predominated. 



Larus argentatus. Herring Gull. 



Larus vegae. Vega Gull. — A large Gull with light 

 mantle and black tips to primaries was seen Nov. 5. Six 

 days later several other Gulls having the same style of 

 coloration were also observed. 



Larus californicus. California Gull. — But a single 

 individual had been encountered up to Oct. 9, when a large 

 flock was discovered among the Gulls thronging the beach. 

 Afterwards the species was met with at intervals. 



Larus delawarensis. Ring-billed Gull. — An immature 

 example was taken Oct. 7. 



Larus brachyrhynchus. Short-billed Gull. 



Larus canus. Mew Gull. — A young bird belonging to 

 one or the other of these species was captured Oct. 29. 



Larus heermanni. Heermann's Gull. — Until the last 

 day of September, Heermann's Gulls appeared to be rather 

 scarce. In November their flights rivalled or exceeded 

 those of the Western Gulls. 



Larus Philadelphia. Bonaparte's Gull. — On the 6th 

 of November two small companies were met with, and on 

 the following day another company and a flock of over two 

 hundred. 



Sterna maxima. Royal Tern. — This Tern occurred 

 through my sojourn, but was not common after the middle 

 of October. 



