Terns. 
63. Gull-billed Tern (Gelochelidon nilotica). L. 
14.5; T. 5.5.  Ads., summer. Bill thick, short, black; 
tail short, forked only 1.5; crown black; above pearl; 
below white. Ads., winter. Head white, with black 
patch before and behind eye. Yxg. Similar, but above 
edged with buffy; head and neck streaked with gray- 
ish. Notes. A high, thin, somewhat reedy ¢ee-tee-tee, 
sometimes suggesting a weak-voiced katydid. 
Range.—Cosmopolitan; breeds in North America from Mexico to 
Florida and north to Virginia; wanders north rarely to New Bruns- 
wick; winters from southern Texas southward. 
73. Aleutian Tern (Sterna aicutica). L. 14. T. 
6.7, forked 3.  Ads., summer. Above and below pearl 
gray, browner below; throat white; crown black; fore- 
head white; line from bill to eve black. Ads., winter. 
‘‘With rather more white on forehead.’”? (Gat. B. M.) 
Notes. ‘‘A thin, clear, trilling whistle.’’ (Nelson.) 
Range.—Alaska from Kadiak to Bering Strait, southwest to Japan. 
474, Least Tern (Sterna antillarum). L. 9; T. 3.55 
forked 1.7. <Ads., summer. Bill yellow, black at tip; 
forehead white; a black line from bill to eye; crown 
black; above pearl; below white. Ads., winter. Crown 
white; nape black; bill dark; tail shorter. Yung. Sim- 
ilar to last, but above with buffy or brownish. Notes. 
“A sharp Squeak much like the cry of a very young 
pig following its mother.”’ 
Range.—Western hemisphere; breeds locally from northern South 
America northward to Massachusetts, Dakota, and southern Cali- 
fornia; winters south of United States. 
76. Bridled Tern (Sterna anccthetus). L.15. Ads. 
Forehead and line over eye white; lores and crown 
black; nape whitish; back sooty gray or sooty brown; 
outer tail feathers white, except at tip; inner ones 
grayish brown. Notes. A soft qua. 
Range.—Tropical regions; north in Atlantic to the Bahamas; casual 
in Florida. 
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