BONAPARTE GULL. 
60. Larus Philadelphia. 14 inches. 
In summer, tip and outer web of outer primaries black; inner 
web and shaft white, with a black bill. The head and neck 
are gray; while in winter the head is white with gray spots 
back of the eyes. Young birds have the back mixed with 
brownish and the tail with a band of black near the tip. They 
are rarely found in the II. S. with the black hood. 
Nest. —They nest in great numbers in the marshes of the 
northwest. The nests of sticks and grass are placed on the 
higher parts of the marshes and the usual complement of three 
eggs is laid. The eggs are grayish to greenish brown, marked 
with dark brown spots (1.90 x 1.30). 
SABINE GULL. 
62. Xema sabini. 13 inches. 
A handsome bird, having the slaty hood bordered behind with 
a black ring; the primaries black, white tipped, and the tail 
slightly forked. In winter the head and throat white with 
the back of the neck dusky. 
Nest. —They breed abundantly on the marshes of northern 
Alaska and Greenland. The two or three eggs are greenish 
brown in color and marked with dark brown (1.75x 1.25). 
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