36 University of California Puhlications in Zoology. [Vol. 7 



One specimen was preserved (no. 9918), a female shot at 

 Three-mile Arm, Kuiu Island, on April 26. It is not in the 

 adult summer plumage, but in the stage described by Coues as 

 "approaching maturity" (1903, p. 991), with all but the first 

 two primaries lacking the white sub-apical spot, the "mantle" 

 of a paler blue, and many of the lesser wing coverts edged with 

 gray or brownish. It is undergoing molt about the head and 

 throat. 



Larus Philadelphia (Ord). Bonaparte Gull. 



First seen at Three-mile Arm, Kuiu Island, on April 30, 

 when a flock of about a dozen passed overhead, flying in a com- 

 pact body. On the evening of INIay 3, at the same place, several 

 appeared near the launch, circling about over the surface of the 

 bay. Their manner of feeding is to fly slowly back and forth, 

 some three or four feet above the water, frequently dipping down 

 and picking up something without checking their flight. Many 

 were seen hawking over the water in this manner, and it seems 

 to be characteristic of the species, for I have observed them 

 feeding thus in southern California, and on the lakes in northern 

 Illinois. 



It was not met with elsewhere during the spring migration, 

 and was next seen on the evening of June 16, when a large flock 

 was encountered in Behm Narrows, at the north end of Revil- 

 lagigedo Island. On June 28 a flock of a hundred or more was 

 seen in Behm Canal, between Portage Cove and the mouth of the 

 Chickamin River, and three specimens were secured. All of 

 these birds were in various stages of the immature plumage, and 

 the flock included none with black heads. Scattered individuals 

 were seen on July 4, all along Behm Canal; and, at Bradfield 

 Canal, July 18 to 26, the species was very abundant on the mud 

 flats. From then on it was met with nearly everywhere. On 

 INIitkof Island, August 1 to 13, it was abundant along the 

 beach, in large flocks; at Thomas Bay, August 13 to 23, it was 

 exceedingly abundant on the broad expanse of nuid flats exposed 

 by the receding tide; at Port Snettisham, August 24 to Sep- 

 tember 2, it was seen daily though not in large numbei's; and 



