132 



INDEX TO KEY TO FAMILIES. 



Group 4. Birds having wings measuring from 3,25 to 9.50 inches 

 long 



Section 1. Bill with strong hook, toes armed with talons 

 Section 2. Upper mandible with more or less hook, but toes 



not armed with talons .... 

 Section 3. Tip of upper mandible not notched or hooked 



Part 1. First primary less than half as long as 



third, sometimes very small . 

 Part 2. First primary more than half as long as 



third 



Group 5. Birds having wings over 9.50 inches long 



139 



139 



140 

 141 



141 



143 

 147 



