56 CHECK-LIST OF NORTH AMERICAN BIRDS. 



Range. — Eastern Pacific Ocean. Breeds on islands off Lower 

 California; south in migration to western Mexico, Panama, and 

 Ecuador. 



Genus THALASSIDROMA Vigors. 



Thalassidroma Vigoks, Zool. Journ., II, 1825, 405 (note). Type, by 

 orig. desig., Procellaria pelagica Linnaeus. 



Thalassidroma pelagica (Linn^us). Storm Petrel. [104.] 



Procellaria pelagica Linn^tis, Syst. Nat., ed. 10, I, 1758, 131. (Coast 

 of Sweden.) 



Range. — The more easterly portions of the Atlantic Ocean south 

 to'the Mediterranean and west coast of Africa. Said to occur at times 

 on the Newfoundland Banks and off the coast of Nova Scotia. 

 Breeds on islands off Great Britain. 



Genus OCEANODROMA Reichenbach. 



Oceanodroma Reichenbach, Syst. Avium, 1852, iv. Type, by orig- 

 desig., Procellaria furcata Gmelin. 



Subgenus OCEANODROMA. 



Oceanodroma furcata (Gmelin). Forked-tailed Petrel. [105.] 



Procellaria furcata Gmelin, Syst. Nat., I, ii, 1789, 561. ("Among the 

 ice between Asia and America. ") 



Range. — North Pacific and adjacent Arctic Ocean. Breeds from 

 Commander and Aleutian islands south to islands off Oregon; in 

 migration occurs on both shores of Bering Sea north to Kotzebue 

 Soimd; wanders south to San Pedro, California; accidental on Tanana 

 River, Alaska. 



Subgenus CYMOCHOREA Coues. 



Cymochorea Coues, Proc. Acad. Nat. Sci. Phila., 1864, 75. Type, by 

 orig. desig., Procellaria leucorhoa Vieillot. 



Oceanodroma kaSdingi Anthony. Kaeding's Petrel. [105.2.] 



Oceafiodroma kaedingi Anthony, Auk, XV, Jan., 1898, 37. (Near Guada- 

 lupe Island, Lower California.) 



