INDEX TO KEY TO FAMILIES. 

 LAND BIRDS. 



Group i. Birds having wings less than 1.75 inches long. See 



page 117. 

 Group 2. Birds having wings from 1.75 to 2.75 inches long. See 



page 117. 

 Section i. First primary less than half as long as third. See 



page 117. 

 Part i. Tip of upper mandible with small but distinct hook 



or notch. See page 117. 

 Part 2. Upper mandible without notch or hook at tip. See 



page 1 1 8. 

 Section 2. First primary more than half as long as third. See 



page 119. 

 Part i. Tip of upper mandible with small but distinct hook or 



notch. See page 119. 

 Part 2. Tip of upper mandible, not notched or hooked. See 



page 120. 

 Group 3. Birds having wings measuring from 2.75 to 3.25 inches 



long. See page 121. 

 Section i. First primary less than half as long as third. See 



page 121. 

 Part i. A small but distinct hook or notch at tip of upper 



mandible. See page 121. 

 Part 2. Tip of upper mandible not notched or hooked. See 



page 121. 

 Section 2. First primary not short, always more than half as long 



as third. See page 122. 

 Part i. Tip of upper mandible with small but distinct hook or 



notch. See page 122. - 



Part 2. Tip of upper mandible not notched or hooked. See 



page 122. 

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



long. See page 124. 



Section i. Bill with strong hook, toes armed with talons. See 

 page 124. 



