PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 223 



731. Podiceps Jiolholli Eeinh. American Eed necked Grebe. (Young 

 in down.) 



732. Dytes auritus (Linn.) Eidgw. Horned Grebe. (Young in down.) 

 t733. Bytes nigricolUs (Brebm.) Eidgw. Eared Grebe. (American speci- 

 mens; young in down.) 



736. Colymhiis torquafus Briinn. Loon. (Downy young.) 



737. Colymhiis adamsi Gray. Great White-billed Loon. (^^ specially 

 downy young.) 



738. Colymlms arcticus Linn. Black-throated Diver. (Downy young.) 



739. Colymhns pacijimis Jjawv. Pacific Diver. (Downy young.) 



740. Colymhus septentrionalis Linn. Eed-throated Diver. (Downy 

 young.) 



t741. AI ca impennis hinn. Great Auk. 



742. JJtamania tordaCLmn.) Jjeach. Eazor -billed Auk. (Downy young.) 



743. Fraterculaarctica(Lu]n.)^teiih. Common Puf&n. (Downy young.) 

 *743rt. Frafercula arctica glaciolis (Leach) Eidgw. Large-billed Puflin. 



746. Ceratorlmia monocerata (Pall.) Cass. Horn-billed Puffin. (Downy 

 young.) 



747. Phaleris psittacula (Pall.) Temm. Parrot Auk. (Downy young, 

 young in first plumage, and winter adults.) 



748. Simorhynchus cristatellus (Pall.) Merrem. Crested Auk. (Downy 

 young.) 



749. Simor1iy7ichus pygmceus {Gmel.)'Ridgw. Whiskered Auk. (Adults 

 in breeding plumage and in winter; downy young.) 



751. PtycorJiamphus alciiiicus (Pall.) Bouap. Cassin's Auk. (Downy 

 young.) 



752. Alle nigricans Link. Sea Dove ; Dovekie. (Downy young.) 



753. S]jntMihorliamphns antiquus (Gm.) Cones. Black-throated Guille- 

 mot. (Downy young.) 



754. Synthlihorhamphns ivurmizusume (Temm.) Coues. Temminck's 

 Guillemot. (Series, all stages.) 



755. Brachyrhamphus marmoratus (Gm.) Brandt. Marbled Guillemot. 

 (Downy young.) 



756. Brachyrhamphus MttUtzi Brandt. Kittlitz's Guillemot. (Series, 

 all stages, but especially downy young.) 



757. Brachyrhamphus hypoleucus Xantus. Xautus's Guillemot. (Sum- 

 mer adults and downy young.) 



758. Brachyrhamphus craveri (Salvad.) Coues. Graver's Guillemot. 

 (Summer adults and downy young.) 



*759. Brachyrhamphns hrachypterus Brandt. Short- winged Guillemot. 

 * 762. TJria carbo (Pall.) Gray. Sooty Guillemot. 



