132 



INDEX TO KEY TO FAMILIES. 



Qroup 4. Birds having wings measuring from 3.25 to 9.50 inches 



long 139 



Section 1. Bill with strong hook, toes armed with talons . 139 



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



not armed with talons ..... no 



Section 3. Tip of upper mandible not notched or hooked . m 

 Part 1. First primary less than half as long as 



third, sometimes very small . . . 14] 



Part 2. P'irst primary more than half as long as 



third ....... 143 



Qroup 5. Birds having wings over 9.50 inches long . .147 



