CONTENTS 



Page 



Genus Buteo 93 



Buteo borealis borealis. Red-tailed Hawk 93 



Buteo borealis krideri. Krider's Hawk 108 



Buteo borealis calurus. Western Red-tail 110 



Buteo borealis harlani. Harlan's Hawk 112 



Buteo lineatus lineatus. Red-shouldered Hawk 115 



Buteo swainsoni. Swainson's Hawk 119 



Buteo platypterus. Broad-winged Hawk 125 



Buteo platypterus iowensis. Iowa broad-winged 



Hawk . 130 







Genus Asturina 132 



Asturina plagiata. Mexican Goshawk 132 



Genus Archibuteo 133 



Subgenus Archibuteo 133 



Archibuteo lagopus sancti-johannis. Rough- 

 legged Hawk 133 



Subgenus Brewsteria 139 



Archibuteo ferrugineus. Ferruginous Rough-leg 139 



Genus Aquila 142 



Aquila chrysaetos. Golden Eagle 142 



Genus Haliaeetus 147 



Haliaeetus leucocephalus leucocephalus. Bald Eagle. 147 



Family Falconidae. Falcons, Caracaras, etc 152 



Subfamily Falconinae. Falcons 152 



Genus Falco ...152 



Falco mexicanus. Prairie Falcon 152 



Subgenus Rhynchodon 157 



Falco perigrinus anatum. Duck Hawk 157 



Subgenus Tinnunculus 162 



Falco columbarius columbarius. Pigeon Hawk 162 



' Falco columbarius richardsoni. Richardson's 



Pigeon Hawk 167 



Subgenus Cerchneis 169 



Falco sparverius sparverius. Sparrow Hawk 169 



Family Pandionidae. Ospreys 175 



Genus Pandion 175 



Pandion halisetus carolinensis. Osprey 175 



Suborder Striges. Owls 178 



Family Aluconidse. Barn Owls 178 



Genus Aluco 178 



Aluco pratincola. Barn Owl 178 



