56 CHECK-LIST OF NORTH AMERICAN BIRDS. 
RancGE.— Eastern Pacific Ocean. Breeds on islands off Lower 
California; south in migration to western Mexico, Panama, and 
Ecuador. 
GENUS THALASSIDROMA Vicors. 
Thalassidroma Vicors, Zool. Journ., II, 1825, 405 (note). Type, by 
orig. desig., Procellaria pelagica LINN&US. 
Thalassidroma pelagica (LINN&uS). Storm Petrel. [104.] 
Procellaria pelagica Linn=us, Syst. Nat., ed. 10, I, 1758, 131. (Coast 
of Sweden.) 
RancE.— 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 ReEIcHENBACH. 
Oceanodroma REICHENBACH, Syst. Avium, 1852, iv. Type, by orig- 
desig., Procellaria furcata GMELIN. 
Suscenus OCEANODROMA. 
Oceanédroma furcéta (GMELIN). Forked-tailed Petrel. [105.] 
Procellaria furcata GMELIN, Syst. Nat., I, ii, 1789, 561. (‘‘Among the 
ice between Asia and America.’’) 
Rance.— 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 
Sound; wanders south to San Pedro, California; accidental on Tanana 
River, Alaska. 
Suspcenus CYMOCHOREA Covgs. 
Cymochorea Couxs, Proc. Acad. Nat. Sci. Phila., 1864, 75. Type, by 
orig. desig., Procellaria leucorhoa VIEILLOT. 
Oceanodroma kaédingi ANTHONY. Kaeding’s Petrel. [105.2.] 
Oceanodroma kaedingi ANTHONY, Auk, XV, Jan., 1898, 37. (Near Guada- 
lupe Island, Lower California.) 
