TABLE OF CX)NTENTS. XIll 



Genus 4. Uria Briason 717 



Key to the Species and Subspecies of Uria 719 



4. Uria ringvia Briinnich 719 



5. Uria troille troille (Linnaeus) 721 



6. Uria troille californica (Bryant) 724 



7. Uria lomvia lomvia (Linnaeus) 726 



8. Uria lomvia arra (Pallas) 730 



Genus 5. Cepphus Pallas 732 



Key to the Species of Cepphus 733 



9. Cepphus grylle (Linnaeus) 733 



10. Cepphus mandtii (Mandt) 737 



11. Cepphus columba Pallas 740 



12. Cepphus motzfeldi (Benicken) 742 



13. Cepphus carbo Pallas 743 



Genus 6. Brachyramphus Brandt 745 



Key to the Species of Brachyramphus 746 



14. Brachyramphus marmoratus (Gmelin) 746 



15. Brachyramphus brevirostris (Vigors) 749 



Genus 7. Endomychura Oberholser 751 



Key to the Species of Endomychura 751 



16. Endomychura hypoleuca (Xantus) 752 



17. Endomychura craveri (Salvadori) 753 



Genus 8. Synthliboramphus Brandt 755 



Key to the Species of Synthliboramphus 756 



18. Synthliboramphus antiquus (Gmelin) 757 



Genus 9. Ptychoramphus Brandt 760 



19. Ptychoramphus aleuticus (Pallas) 761 



Genus 10. Phaleris Temminck 763 



20. Phaleris psittacula (Pallas) 764 



Genus 11 . Ciceronia Reichenbach 767 



21. Ciceronia pusilla (Pallas) 768 



Genus 12. Alcella Stone 770 



22. Alcella pygmaea (Gmelin) 771 



Genus 13. ^thia Merrem 774 



23. ^thia cristatella (Pallas) 775 



Genus 14. Cerorhinca Bonaparte 778 



24. Cerorhinca monocerata (Pallas) 779 



Genus 15. Fratercula Brisson 782 



Key to the Species and Subspecies of Fratercula 783 



25. Fratercula arctica arctica (Linnaeus) 784 



26. Fratercula arctica naumanni Norton 788 



27. Fratercula corniculata (Naumann) 789 



Genus 16. Lunda Pallas 792 



28. Lunda cirrhata (Pallas) 793 



Addenda 797 



Index 797 



