S. SUPERCILIARIS ANTILLARUM : LEAST TERN. 



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, 9.00-10.00 ; tail, 5.00-8.00 ; bill, 1.33-1.67, 

 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 5. 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 ,. ,. -, TII 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- 1 S)> 



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 



