160 KEY TO THE BIRDS OF EASTERN NORTH AMERICA, 
FAMILY FALCONID. 
HAWKS, FALCONS, EAGLES, ETC. 
GROUP 1. Wing, less than 8.50 inches long. See page 162. 
GROUP 2. Wing, 8.50 to 9.50 inches long. See page 163. 
Group 3. Wing, 9.50 to 13 inches long. See page 164. 
Section 1. Species having second primary longest. See page 165. 
Section 2. Species having third primary longest. See page 166. 
Section 3. Species having fourth primary longest. See page 166. 
Group 4. Wing, 13 to 15 inches long. See page 167. 
Section 1. Second primary, longest; first and second primaries, emarginate or notched. 
See page 167. 
Section 2. Third primary, longest; face, bare. See page 167. 
Section 3. Fourth primary, longest; upper tail coverts, white. See page 168. 
Section 4. Fourth primary, longest; upper tail coverts, not white. See page 168. 
GROUP 5. Wing, 15 to 17 inches long. See page 170. 
Section 1. Second primary, longest; only first primary, notched. See page 171. 
Section 2. Second primary, longest; first and second primary, notched. See page 171. 
Section 3. Third primary, longest. See page 171. 
Section 4. Fourth primary, longest; four or five outer primaries, notched; upper tail! 
coverts, white. See page 173. 
Section 5. Fourth primary, longest; four or five outer primaries, notched; upper tail 
coverts, not white; no feathers on the tarsus. See page 173. 
Section 6. Fourth primary, longest; four or five outer primaries, notched; upper tail 
coverts, not white; tarsus, partly feathered. See page 173. 
Section 7. Fourth primary, longest; four or five outer primaries, notched; tarsus, 
entirely feathered. See page 174. 
Section 8. Fourth primary, longest; three outer primaries, notched. See page 174. 
GrouP 6. Wing, 17 to 21 inches long. See page 174. 
Section 1. Third primary, longest; tarsus, wholly feathered. See page 174. 
Section 2. Third primary, longest; tarsus, not wholly feathered. See page 177. 
- 
Section 3. Fourth primary, longest; tarsus, without feathers. See page 178. 
Section 4. Fourth primary, longest; tarsus, partly feathered. See page 178. 
Section 5. Fourth primary, longest; tarsus, entirely feathered. See page 178. 
GROUP 7. Wing, over 21 inches long. See page 179. 
