AMERICAN ORNITHOLOGY. 



207 



A. O. U. No. 69, Foster's Tern, {Sterna 



fosteri) . 



Length, 15 in. Found througliout North America 

 and breeds through the United States and southern 

 Canada. Bill and feet, orange red, the former having 

 the terminal half black. Back and wings, light pearl 

 gray. The under parts and tail, white. The outer 

 primaries are the same color as the back. Tail longer 

 and more deeply forked than the others of this group. 

 In winter the bill and feet become dusky and the black 

 cap on the fore part of the he;id becomes mottled with 

 white. 



A. O. U. No. 70, Common Tern, (Sterna 



hirundo. 



Length, 14.5 in. Found in North America chiefly 

 east of the Plains. Breeds from the Arctic coast to the 

 Gulf States. Upper parts of a pearl gray, a shade 

 darker than that of Foster's. Under parts a still 

 lighter pearl gray, changing to white on the throat and 

 under coverts. Outer web of the first primary is 

 black, the remaining outer ones are grayish black with 

 a silvery hoariness. The outer web of the outer tail 

 feather is also dark. Bill and feet, coral red, the 

 former with the terminal half black. 



71, Arctic Tern, {Sterna para- 



A..O. U. No. 

 I disaea). 



Length about 15 in. Breeds from Massachusetts to 

 the Arctic circle and winters from Virginia and Cali- 

 fornia northwards. Bill and feet entirely lake red. 

 Feet are very small, the tarsus being much shorter than 

 that of the proceeding. Outer web of first primary, 

 black, the remaining ones being silvery. Upper and 

 under parts pearly gray, tiie latter being of a lighter 

 shade, in winter they show the usual white on the 

 crown and forehead. 



A. O. U. No. 72, Roseate Tern, {Sterna 



dous.alli. 



Length, 14.5 in. Founa on the Atlantic coast from 

 Massachusetts southwards. The greater part of the 

 bill is black, it being red only at base. Feet, bright 

 red. Neck and entire under parts snowy white, tinted 

 with a delicate rosy blush. Upper parts a pale pearly 

 gray. Outer web of outer primary black, the others 

 silver. In winter the bill is black and the feet dull. 

 The rosy tint is wanting and the black cap has chang- 

 ed to white on the forehead. 



