abundant as usual. The species are in about the same proportion as they have been the last week. Several Larus philadelphia were seen flutter- ing over some drift this evening on the San Francisco side of the bay. One Larus occidu- talis in nearly adult plumage was observed this evening. Larus glaucescens is as tame as ever, numbers following the boats with great numbers of the last species. I noted about ten Larus glaucescens riding on the hurri- cane deck of an incoming steamer this evening. A nearly adult one was observed yesterday. An almost adult Larus californicus was seen this evening with outer rectrices black and the inner ones pure white! Usually the black on the tail shows in the form of a band at the end: This is the first instance I have seen of this phase of the moult. Apr. 19, 1907. Alameda to and from San Francisco, cal. Conditions:- Very warm; westerly wind; clear. In the morning in the light near the roundhouse