682 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult male.— Wing, 349-374 (361.9); tail, 172-243 (207.9) «; 

 exposed culmen, 38-43.5 (40.4); tarsus, 48-54 (52); middle toe, 

 42-47 (44.6).^ 



Adult female.— Wing, 351-370 (359.7); tail, 128-205.5 « (181.2); 

 exposed culmen, 38-44 (40.2); tarsus, 50-55 (52.1); middle toe, 

 42-48 (46.1).<= 



Breeding on western coast of Greenland (from lat. 64° N. to 

 Upernavik, lat. 73° N.), North Somerset Island (Fm*y Point), coast 

 of Mackenzie (Cape Lisburne; Cape Bathurst; Franklin Bay; 

 mouth of Anderson River), Melville Peninsula (Igloolik), Baffin 

 Land (Exeter Sound), and northern coast of Alaska (Point Barrow; 

 Cape Lisburne) — probably also on Melville Island — also in Arctic 

 districts of Eastern Hemisphere (Novaya Zemlya; Kanin Peninsula; 

 Yenesei River; Golchika), as far northward as lat. 83°, north of 

 Spitzbergen; recorded also, but not as breeding, from Melville Island, 

 Whalefish Islands, Spitzbergen, Jan Mayen Land, LutkeLand, Great 

 Liakoff Island, Aleutian and Pribilof Islands, Bering Strait, Hudson 

 Strait, and many other Arctic localities; migrates southward as far as 

 Galapagos Archipelago (off North Albemarle Island, Dec. 15, 1897), 

 coast of Peru (CaUao Bay, Dec, Nov. 17, 1S83), Madeira, Atlantic 

 coast of southern Africa (Walvisch Bay), coast of Burma, and 

 northern Australia. ^ 



« Measurements of the tail are of the middle pair of rectrices, which vary greatly 

 in their development. 

 ^ Ten specimens. 

 c Nine specimens. 



<i Records in United States are, in part, as follows: 

 Massachusetts: Near Lynn, July 5, 1889. 

 Rhode Island: Block Island, Oct. 11, 1895. 



New York: Little and Great Gull islands, Aug. 6-16, 1888, common; Ossining, 

 Oct. 18, 1877; Montauk, Oct. 30, 1889. 

 New Jersey: Long Beach, Dec, 1876; Andalusia. 

 Pennsylvania: Peach Bottom, I^ancaster County, July 11, 1869. 



