BIRDS OF MASSACHUSETTS, ETC. 91 



autumn visitant. Not common. Occasional in summer. 

 Other species of Sterna undoubtedly occur as rare 

 visitors off our coast, as the Caspian Tern (Sterna 

 caspia Pall.,) in winter, from the north ; and possibly, at 

 the same season, Trudeau's Tern (Sterna Triideauil Aud.J 

 as a very rare, or accidental species. 



93. Hydrochelidon fissipes Gray. ( Hydrochelidon plum- 

 bea Wils.) Short-tailed Tern. Not common. Have seen 

 specimens taken near Chelsea Beach. 



94. Colymbus arcticus Linn. Black-throated Diver, 

 rare autumn and winter visitor. 



95. Utarnania torda Leach. Razor-billed Auk. Not 

 uncommon on the coast in autumn and winter. 



96. Mormon arctica 111. Arctic Puffin. Not uncommon 

 in winter. 



97. Uria (frylle Lath. Black* Guillemot. Not very 

 uncommon winter visitant. 



98. Cataractes troile Bryant. Foolish Guillemot. 

 Murre. Not uncommon in winter, and perhaps a few 

 breed. 



99. Cataractes ringvia Bryant. Murre. Common in 

 winter. 



100. Cataractes lomvia Bryant. (Uria arra PallJ 

 Thick-billed Guillemot. Murre. Rather common in winter. 



101. Mergulus alle Vieill. Little Auk. Sea Dove. 

 Rather rare winter visitant. Has been taken on the 

 Connecticut, at Greenfield, Mass., in one instance. 



The birds found in Massachusetts may be conveniently 

 grouped into the following- classes : I. Species that reg- 

 ularly breed in the State. II. Resident species. III. 

 Winter visitants. IV. Spring and autumn visitants. V. 

 Summer visitants. VI. Accidental or irregular visitants. 



I. Species that regularly breed in the State. 



Those marked with a star, though repeatedly found breeding in some lo- 

 calities, breed very sparingly, and not generally over the State. Some 

 others are common in some parts of the State, but are unknown or very rare 



