PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 221 



627 a. Somateria molUssima dresseri (Sharpe) Coues. American Eider. 

 (Dowuy young.) 



629. Somateria spectabilis (Linn.) Boie. King Eider. (Downy young.) 



630. (Eclemia americana Sw. & Rich. American Scoter. (Downy young.) 

 t [031.] Mclanetta fusca (Linn.) Boie Velvet Scoter. (American speci- 

 mens; downy youug.) 



632. Melanettavelvetma{Gii&^.)'B^\vA. American Velvet Scoter. (Downy 

 young.) 



633. PeUonettaj)ersinGillata{L\m\.)K^i\,\\.^. Surf Duck. (Downy young.) 

 t635. NomonyxdominicAis {\A\n\.)'R\(\g^. Black Masked Duck. (Adult 



male with black head, and dowuy young.) 



Q'^Ck Mergus merganser americanus (Cass.) Ridgw. American Sheldrake. 

 (Downy young.) 



644. Phalacrocorax mexicanus (Brandt) Scl. & Salv. Mexican Cormo- 

 rant. (Adults in nuptial plumage.) 



* 648. PhaJacrocorax perspiciUatus Pall. Pallas's Cormorant. 



657. PagopMla eburnea (Phijips) Kaup. Ivory Gull. (Downy young.) 

 661. Larus leucopterus Faber. White-winged Gull. (Downy young.) 

 602. Larus glaucescens Licht. Glaucous-winged Gull. (Downy young.) 



* [605.] Larus affinis Reinh. Siberian Gull. 



667. Larus cacMmians Pall. Pallas's Herring Gull. (Series, especially 

 young and downy young.) 



669. Larus delaibarensis Ord. Ring-billed Gull. (Downy young.) 



670. Larus hrachyrJiynchus Rich. Short-billed Gull. (Downy young.) 

 [671.] Larus canus Jjinn. Mew Gull. (Downy young.) 



672. Larus heermanni Cass. Heerman's Gull. (Downy young.) 



674. Larus franklini Sw. & Rich. Franklin's Gull. (Downy young.) 



675. Larus 2}Mladelphiw (Ord) Gmy. Bonaparte's Gull. (Dowuy young.) 

 670. Bliodostefhia rosea (Macgill.) Bruch. Ross's Gull. (Adult and 



downy young.) 

 677. Xema sabinei (J. Sabine) Leach. Sabine's Gull. (Downy young.) 

 *678. Creagrus fureatus (Neb.) Bp. Swallow-tailed Gull. 

 6S0. Sterna caspia Pnll. Caspian Tern. (Young in tirst plumage.) 



681. Sterna, regia Gamb. Royal Tern. (Young in first plumage and 

 downy young.) 



682. Sterna elegans Gamb. Elegant Tern. (Young in first plumage and 

 downy young.) 



683. Sterna cantiaca acuflavida (Cabot) Ridgw. Cabot's Tern. (Downy 

 young.) 



684. Sterna trudeaui Aud. Trudeau's Tern. (All stages, but especially 

 summer adult and young, all ages.) 



688. Sterna dougalU Montag. Roseate Tern. (Downy young.) 



689. Sterna aleutica Baird. Aleutian Tern. (Downy young.) 



691. Sterna fuligi7wsa Gml. Sooty Tern. (Downy young.) 



692. Sterna anwstheta Scop. Bridled Tern. (Downy young.) 



694. Hydrochelidon leucoptera (Weisn. & Schinz.) Boie. White-winged 

 Black Tern. (Downy young ; young in first plumage ; winter adult.) 



