CATALOGUE OF CANADIAN BIRDS. 4I 



boulders rise above the surface. Upon these rocks the nests 

 consisting of mosses and grass are built, usually one to each rock, 

 but two or more if room for them. Two or three of the small 

 islands in Gaspereau lakes are also used for breeding places. 

 One island, upon which there were two nests, was not more than 

 15 yards long b}^ lO wide and at its highest point not more than 

 4 feet above the water. {H. F. Tufts.) 



48. Slaty-backed Gull. 



Lams schistisagus Stejn. 1884. 

 In September, 1880, Capt. C. L. Hooper, of the "Corwin," took 

 the first example of this bird known from the west coast of Am- 

 erica, at the Diomede islands, Bering strait. {Nelsofi.) Abund- 

 ant, feeding at the mouth of the river falling into the head of 

 Chernoffsky bay, Unalaska, October 1st, 1880. {Dr. Bean.) As 

 Stejneger found it breeding on the Asiatic coast, it is doubtless 

 commoner than its present limited known range indicates. 



49. Western Gull. 



Lams occidentaUs Aud. 1839. 



Found along the Vancouver island coast and in the Gulf of 

 Georgia. {Lord.) A resident of British Columbia; very abund- 

 ant on the coast during the winter months; found breeding in the 

 Similkameen valley. {Fa?ifn?i.) Common in Burrard inlet in 

 April, 1889; large flocks were seen at Comox, May 2nd, 1887, and 

 a few between Comox and Nanaimo VancOu\-er Island on May 

 6th. {Macomi) 



50. Siberian Gull. 



Lams affinis Reinh. 1853. 



Northern Asia. Accidental in southern Greenland. {Ridgway.) 

 Only North American as occurring in Alaska and accidentally in 

 Greenland. {Cones.) 



51. Herring Gull. 



Lams argent a tns Brunn. 1764. 



Exceedingly rare bird in Greenland and not known to have 

 occurred further north than Gotthaab. {Arct. Man.) 



