398 ALCID^ : AUKS. 



Black Guillemot, Sea Puffin, and Razor-bill. It is sin- 

 gular that Dr. Brewer should have not only made two 



Fig. 86. — Common Guillemot. Nat. size. 



species of this single one, but should have assigned 

 them different breeding ranges (Pr. Bost. Soc, xvii, 

 1875, p. 450). 



THICK-BILLED, OR BRUNNICH'S GUIL- 

 LEMOT. 



LoMviA ARRA {Pall.) Coues. 



Chars. Very similar to the last; depth of bill at nostrils about one- 

 half the length of culmen ; tomia of upper mandible at base 

 dilated, denuded, usually yellowish. 



Fig. S7. — Thick-billed Guillemot. Nat. size. 



This is the common winter Guillemot of the New 

 England coast, and probably most of the statements 

 supposed to have been based upon L. troile really apply 



