PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 221 



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

 (Downy yonng.) 



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



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

 t [631.] Melanetta fusca (Liun.) Boie Velvet Scoter. (American speci- 

 mens; downy young.) 



632. Melanettavelvetina{Cass.)'BsiiTd. American Velvet Scoter. (Downy 

 young.) 



633. Felionetta perspicillata{Lmu. )Kani^. Surf Duck. (Downyyoung.) 

 1 635. Nomomjx dominicus (Linn.) Ridgw. Black Masked Duck. (Adult 



male with black head, aud downy young.) 



636. Mergus merganser americanus (Cass.) Ridgw. American Sheldrake. 

 (Downy young.) 



644. Fhalacrocorax mexicanus (Brandt) Scl. & Sal v. Mexican Cormo- 

 rant. (Adults in nuptial plumage.) 



* 648. Fhalacrocorax perspicillatus FaM. Pallas's Cormorant. 



657. Fagopliila eburnea (Phipps) Kaup. Ivory Gull. (Downy young.) 



661. Lams leucojjterus Faber. White-winged Gull. (Downy young.) 



662. Lams glaucescens Jjicht. Glaucous-winged Gull. (Downyyoung.) 



* [665.] Lams affinis Reinh. Siberian Gull. 



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

 young and downy young.) 



669. Tjarus dekucarensis Ord. Ring-billed Gull. (Downyyoung.) 



670. Lams brachyrhynchns Rich. Short-billed Gull. (Downy young.) 

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



672. Larus heermanni Cuss. Heerman's Gull. (Downyyoung.) 



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



675. Larus Philadelphia (Ord) Gray. Bonaparte's Gull. (Downyyoung.) 



676. Bhodostethia rosea (Macgill.) Bruch. Ross's Gull. (Adult and 

 downy young.) 



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

 *67S. Creagrus furcatus (Neb.) Bp. Swallow- tailed Gull. 



680. Sterna caspia Pall. Caspinn Tern. (Young in first 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 dougalli Montag. Roseate Tern. (Downy young.) 



689. Sterna aleutica Baird. Aleutian Tern. (Downj' young.) 



691. Sterna JuliginosaGm]. Sooty Tern. (Downyyoung.) 



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



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

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



