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TABLE OF CONTENTS.
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Genus 2. Panyptila Cabanis 690 Key to the Species of Panyptila 691 2. Panyptila cayanensis (Gmelin) 691 3. Panyptila sancti-hieronymi Salvin 692 Genus 3. Tachornis Gosse 693 Key to the Subspecies of Tachornis phœnicobia 693 4. Tachornis phœnicobia phœnicobia Gosse 694 5. Tachornis phœnicobia yradii (Lembeye) 695 Genus 4. Streptoprocne Oberholser 696 Key to the Species and Subspecies of Streptoprocne 697 6. Streptoprocne zonaris albicincta (Cabanis) 697 7. Streptoprocne zonaris mexicana Ridgway 700 8. Streptoprocne zonaris pallidifrons (Hartert) 701 9. Streptoprocne semicollaris (Saussure) 702 Genus 5. Nephœcetes Baird 703 Key to the Subspecies of Nephœcetes niger 704 10. Nephœcetes niger niger (Gmelin) 704 11. Nephœcetes niger jamaicensis Ridgway 705 12. Nephœcetes niger borealis (Kennerly) 707 13. Nephœcetes niger costaricensis Ridgway 710 Genus 6. Cypseloides Streubel 710 Key to the Species and Subspecies of Cypseloides 711 14. Cypseloides brunneitorques brunneitorques (Lafresnaye) 712 15. Cypseloides brunneitorques griseifrons Nelson 714 16. Cypseloides cherriei Ridgway 714 Genus 7. Chætura Stephens 714 Key to the Species and Subspecies of Chætura 715 17. Chætura pelagica (Linnæus) 717 18. Chætura richmondi Ridgway 719 19. Chætura gaumeri Lawrence 721 20. Chætura vauxii (Townsend) 722 21. Chætura acuta (Gmelin) 724 22. Chætura cinereiventris fumosa (Salvin) 725 23. Chætura cinereiventris lawrencei Ridgway 727 24. Chætura cinereiventris phæopygos Hellmayr 727 25. Chætura brachyura (Jardine) 728 Suborder Heterodactylæ 729 Family Trogonidæ 731 Key to the Genera of Trogonidæ 732 Genus 1. Pharomachrus De la Llave 733 Key to the Species and Subspecies of Pharomachrus 734 1. Pharomachrus mocinno mocinno De la Llave 736 2. Pharomachrus mocinno costaricensis (Cabanis) 739 Genus 2. Leptuas Cabanis and Heine 740 3. Leptuas neoxenus (Gould) 741 Genus 3. Curucujus Bonaparte 742 Key to the Species and Subspecies of Curucujus 743 4. Curucujus massena (Gould) 744 5. Curucujus melanurus macrourus (Gould) 747 6. Curucujus clathratus (Salvin) 749 Genus 4. Trogon Brisson 750 Key to the Species and Subspecies of Trogon 751 7. Trogon bairdii Lawrence 752 8. Trogon strigilatus chiohurus (Sclater and Salvin) 754
