S. SUPERCILIARIS ANTILLARUM : LEAST TERN. 371 



ROSEATE TERN. 



Sterna dougalli Mont. 



Chars. Bill black, usually orange at base below ; mantle very pale 

 pearly-blue ; primaries with the white band broad and usually 

 extending to the very tip. Below, pure white, or rosy-tinted ; 

 feet coral-red. Changes of plumage as in other species. Length, 

 12.00-16.00; wing, g.oo-io.oo ; tail, 5.00-8.00; bill, i. 33-1.67, 

 very slender ; tarsus, 0.75-0.87. 



This most elegant of all our Terns occurs in New Eng- 

 land under the circumstances 

 already fully detailed under head 

 of S. hirundo. The principal 

 point to be noted is, that this 

 is a southerly bird, unknown in 

 the very high latitudes to which 

 Wilson's and the Arctic Tern re- 

 sort to breed.- In fact, it chiefly 

 occurs with us south of Cape 

 Cod, which may be regarded as 

 the normal limit of its extension, 

 though it is known to occur as 



r , , ^ X 1 1 Fig. 79. — Roseate Tern. 



far north as the Green Islands, 



in Casco Bay, Maine, where Mr. Brewster once observed 



a small flock in July (Bull. Nutt. Club, iv, 1879, p. 15). 



LEAST TERN. 



Sterna superciliaris antillarum {Less.) Coues. 



Chars. Bill yellow, usually tipped with black ; mantle pale pearly 

 grayish-blue, extending unchanged on the rump and tail ; a white 



