VIII BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Order Galliformes : Fowllike birds — Continued. 



Superfamily Phasianoidea : Grouse, pheasants, turkeys — Continued. p 



Family Tetraonidae : Grouse, ptarmigan, etc 63 



Kej' to the genera of Tetraonidae 65 



Genus Dendragapus Elliot 67 



Key to the forms (adults) of Dendragapus obscunis (Say) 69 



Dendragapus obscurus sitkensis Swarth 70 



Dendragapus obscurus fuliginosus Ridgway 74 



Dendragapus obscurus sierrae Chapman 77 



Dendragapus obscurus hozvardi Dickey and van Rossem. ... 80 



Dendragapus obscurus richardsonii (Douglas) 82 



Dendragapus obscurus obscurus (Say) 85 



Dendragapus obscurus pallidus Swarth 8S 



Genus Lagopus Brisson 90 



Key to the North American forms (adults) of the genus 



Lagopus 92 



Lagopus lagopus alascensis Swarth 97 



Lagopus lagopus albus (Gmelin) 100 



Lagopus lagopus alexandrae Grinnell 104 



Lagopus lagopus ungavus Riley 106 



Lagopus lagopus leucoptcrus Taverner 107 



Lagopus lagopus alleni Stejneger 108 



Lagopus niutus evermanni Elliot 109 



Lagopus mutus townsendi Elliot Ill 



Lagopus mutus sanfordi Bent 113 



Lagopus mutus chamberlaini A. H. Clark 114 



Lagopus mutus atkhetuis Turner 115 



Lagopus mutus gabrielsoni Murie 116 



Lagopus mutus nelsoni Stejneger 117 



Lagopus mulus dixoni Grinnell 120 



Lagopus mutus rupestris (Gmelin) 122 



Lagopus mutus welchi Brewster 126 



Lagopus leucurus leucurus (Swainson) 127 



Lagopus leucurus peninsularis Chapman 131 



Lagopus leucurus saxatilis Cowan 132 



Lagopus leucurus rainierensis Taylor 133 



Lagopus leucurus altipetens Osgood 134 



Genus Canachites Stejneger 136 



Key to the forms (adults) of the genus Canachites 137 



Canachites frank linii (Douglas) 138 



Canachites canadensis canadensis (Linnaeus) 143 



Canachites canadensis canace (Linnaeus) 147 



Canachites canadensis atratus Grinnell 150 



Canachites canadensis torridus Uttal 151 



Genus Bonasa Stephens 153 



Key to the forms of Bonasa umbellus (Linnaeus) 155 



Bonasa umbellus umbellus (Linnaeus) 156 



Bonasa umbellus mediana Todd 161 



Bonasa umbellus monticola Todd 163 



Bonasa umbellus sabini (Douglas) 166 



Bonasa umbellus castanea Aldrich and Friedmann 169 



Bonasa umbellus brunnescens Conover 170 



Bonasa umbellus togata (Linnaeus) 171 



Bonasa umbellus affinis Aldrich and Friedmann 175 



