CATALOGUE OF CANADIAN BIRDS. 41 
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 by 10 wide and at its highest point not more than 
4 feet above the water. (A. F. Tufts.) 
48. Slaty-backed Gull. 
Larus 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. (/Velson.) Abund- 
ant, feeding at tte mouth of the river falling into the head of 
Chernoffsky bay, Unalaska, October Ist, 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. 
Larus occidentalis AvpD. 1839. 
Found along the Vancouver island coast and in the Gulf of 
Georgia. (Zord.) A resident cf British Columbia; very abund- 
ant on the coast during the winter months; found breeding in the 
Similkameen valley. (Fannin.) Common in Burrard inlet in 
April, 1889; large flocks were seen at Comox, May 2nd, 1887, and 
afew between Comox and Nanaimo Vancouver Island on May 
6th. (Macoun.) 
50. Siberian Gull. 
Larus affinis REINH. 1853. 
Northern Asia. Accidentalin southern Greenland. (Azdgway.) 
Only North American as occurring in Alaska and accidentally in 
Greenland. (Covwes.) 
51. Herring Gull. 
Larus argentatus BRUNN. 1764. 
Exceedingly rare bird in Greenland and not known to have 
occurred further north than Gotthaab. (Avrct. Man.) 
