372 bulletin: museum of comparative zoology. 



Laridae. 



Sterna paradisaea Brijnnich. 

 ARCTIC tern. 



A colony of about twenty-five pairs was found breeding on a sand 

 spit in the large lagoon on the south side of St. Lawrence Island in 

 June 1913. Several sets of eggs taken June 25 showed that incuba- 

 tion had started. 



One pair was seen at Cape Serdze, Siberia, July 17, 1913. A few 

 were about the ice in Camden Bay, Alaska, during the last of July and 

 early in August 1913. 



The first noted at Demarcation Point in 1914 was a single bird 

 seen May 31. With the exception of about twenty seen on June 8, 

 during a heavy snow storm, there were never more than three or four 

 about. They must have bred in the vicinity, but I could find no nests 

 and came to the conclusion that they may have nested on Icy Reef 

 across the mouth of Demarcation Bay. 



No Common Terns were seen. 



Sterna longipennis Nordmann. 



A small flock was seen at the edge of the ice near the mouth of a 

 small river at Cape Zhipanov, Kamchatka, May 25, 1913. Two 

 males were taken. 



Xema sabini (J. Sabine). 

 Sabine's gull. 



We did not see many of Sabine's Gull during the expedition. 



A few were in Avatcha Bay, Kamchatka during the second week of 

 May 1913, and a single male was taken at Plover Bay, June 18, 1913. 



Early in August 1913, several were noted about the ice in the vicinity 

 of Camden Bay, Alaska. 



The first appearance of this beautiful species during the spring of 

 1914 at Demarcation Point was on May 28 when a single bird was seen 

 flying east. One pair was observed flying about a pond on June 8. 

 Several were seen on June 5 and 7, three on June 8, and the last, a 

 flock of seven, were travelling east on June 19; these, no doubt, bred 

 somewhere east of Demarcation Point. 



