XVI TABLE OF CONTENTS. 



Key to the Species and Subspecies of Otus — Continued. Page. 



40. Otus choliba ( Vieillot) 711 



41. Otus guatemaloe (Sharpe) 715 



42. Otus hastatus hastatus (Ridgway) 718 



43. Otus hastatus thompsoni (Cole) 719 



44. Otus cassini (Ridgway) 720 



45. Otus barbarus (Sclater and Salvia) 723 



46. Otus vermiculatus (Ridgway) 724 



47. Otus nudipes (Vieillot) 727 



48. Otus flammeolus (Kaup) 728 



Genus 9. Lophostrix Lesson 732 



Key to the Species of Lophostrix 733 



49. Lophostrix stricklandi Sclater and Salvin 733 



Genus 10. Bubo Dumeril 736 



Key to the Subspecies of Bubo virginianus 738 



50. Bubo virginianus virginianus (Gmelin) 739 



51. Bubo virginianus pallescens (Stone) 742 



52. Bubo virginianus occidentalis Stone 743 



53. Bubo virginianus pacificus Cassin 745 



54. Bubo virginianus elachistus Brewster 746 



55. Bubo virginianus icelus (Oberholser) 746 



56. Bubo virginianus lagophonus (Oberholser) 747 



57. Bubo virginianus saturatus Ridgway 748 



58. Bubo virginianus heterocnemis (Oberholser) 750 



59. Bubo virginianus algistus (Oberholser) 750 



60. Bubo virginianus wapacuthu (Gmelin) 751 



61. Bubo virginianus melancerus (Oberholser) 753 



62. Bubo virginianus mayensis Nelson 753 



63. Bubo virginianus mesembrinus (Oberholser) 754 



Genus 11. Pulsatrix Kaup 754 



64. Pulsatrix perspicillata perspicillata (Latham) 756 



65. Pulsatrix perspicillata saturata Ridgway (New subspecies) 758 



Genus 12. Ciccaba Wagler 759 



Key to the Species and Subspecies of Ciccaba 760 



66. Ciccaba nigrolineata nigrolineata Sclater 760 



67. Ciccaba virgata virgata (Cassin) 763 



68. Ciccaba virgata squamulata (Bonaparte) 766 



69. Ciccaba virgata tamauUpensis (Phillips) 767 



Genus 13. Nyctea Stephens 767 



70. Nyctea nyctea (Linnaeus) 768 



Genus 14. Surnia Dumeril 772 



Key to the Subspecies of Surnia ulula 773 



71. Surnia ulula caparoch (Miiller) 774 



Genus 15. Glaucidium Boie 779 



Key to the Species and Subspecies of Glaucidium 780 



72. Glaucidium jardinii (Bonaparte) 782 



73. Glaucidium gnoma gnoma Wagler 785 



74. Glaucidium gnoma hoskineii Brewster 788 



75. Glaucidium gnoma pinicola Nelson 789 



76. Glaucidium gnoma californicum (Sclater) 790 



77. Glaucidium gnoma grinnelli Ridgway 791 



78. Glaucidium gnoma swarthi Grinnell 793 



79. Glaucidium palmarum Nelson 793 



80. Glaucidium pumilum griseiceps (Sharpe) 795 



