62 HOW TO NAME THE BIRDS 



143. LAUGHING GULL: BLACK-HEADED GULL. 



Black, slate, white White. 



16-19. Head and fore-neck all round, blackish ; rest of 

 neck, rump, tail, and below, white ; wings and back, slate. 



A southern species, seen only in summer; breeds along coast; 

 nest, on ground, commonly on sand, of sea-weeds, etc.; eggs, 3, 

 greenish, spotted ; in Pa., only migrant on Susquehanna River. 



144. ARCTIC TERN. 



Pearly-blue. 



14-17. Bill, red ; entire top of head, black ; tail, white ; 

 below, a little lighter blue than above ; under tail-coverts, 

 pure white. 



Breeds in same localities as " common tern ; " nesting and eggs, 

 similar. 



145. COMMON TERN: SEA SWALLOW. 



Pearly-blue White. 



13-16. Bill, red; entire top of head, black; back and 

 wings, pearly-blue ; tail, white, forked ; feet, red. 



Breeds on several islands off coast of N. E., and a few on N. J. 

 coast ; nest, on ground, of dried grass, or simply a slight depression ; 

 eggs, middle of Jvtne, 3, drab to buff, splashed with dark spots ; very 

 gregarious. 



146. ROSEATE TERN. 



Pale pearly-blue White, rose-tinted. 



12-16. Bill, black ; glossy black cap ; tail, white, forked; 

 feet, red. 



Breeds in same localities as "common tern;" nest and eggs, 

 similar. 



