PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 223 



731. Podiceps hoJbolli Eeinh. Americau Eed-necked Grebe. (Young 

 iu down.) 



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

 t733. Dytes nigricolHs (Brehin.)Ili(lgvr. Eared Grebe. (American speci- 

 mens; young in down.) 



730. Colymbus torquatus Briinn. Loon. (Dow^ny young.) 



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

 downy young.) 



738. Colymbus arcticns lAnn. Black-tbroated Diver. (Downy young.) 



739. Colymbus 2)ac}Jicvs Jax-wt. Pacific Diver. (Downy young.) 



740. Colymbus sepientrionaUs Linn. Eed-tbroated Diver. (Downy 

 young.) 



f741. Alca impennisljmxi. Great Auk. 



742. Vtamanmtorcla{ljm\\.)ljQ'<\Qh. Eazor-billed Auk. (Downy young.) 



743. i^r«/ercM?«arcttc« (Linn.) Stepb. Common Pufifin. (Downy young.) 

 *743fl. Fratercula arctica (jlacinlis (Leacb) Eidgw. Large-billed Puffin. 



746. Ceratorlilna monocrrota [YnW.) Q'AHS,. Horn-billed Puffin. (Downy 

 young.) 



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

 young in first i)lumage, and winter adults.) 



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

 young.) 



749. Simorhynchus pygmwus {Gmel.)'Ri(\gw. Whiskered Auk. (Adults 

 in breeding plumage and in winter; downy young.) 



751. Ptycorhamphus alcuticus (Pall.) Bouaj), Cassin's Auk. (Downy 

 young.) 



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



753. Synthliborhamplius nntiqnus (Gm.) Coues. Black -throated Guille- 

 mot. (Downy young.) 



754. Bynthliboi'haynphus wurmizusume (Temm.) Coues. Temminck's 

 Guillemot. (Series, all stages.) 



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

 (Downy young.) 



756. Brachyrhnmphus Mttlitzi Brandt. Kittlitz's Guillemot. (Series, 

 all stages, but especially downy young.) 



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

 mer adults and downy young.) 



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

 (Summer adults and downy young.) 



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

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



