INDEX TO KEY TO FAMILIES. 



LAND BIRDS. 



PAGE 

 133 



133 



Group 1. Birds having wings less than 1.75 inches long 

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



Section 1. First primary less than half as long as third . . 133 



Part 1. Tip of upper mandible with small but 



distinct hook or notch . • • 133 



Part 2. L'i)i)er mandible witliout notch or hook 



at tip l-''i 



Section 2. Fiisl primary more than lialf as long as third . 13.) 



Part 1. Tip of upper mandible witli small but 



distinct hook or notch . . • l-">'> 



I'art 2. Tip of upper mandible not notclied or 



hooked l-^-") 



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



long l-'^''' 



Section 1. First primary less than lialf as long as third . 13(> 



Part 1. A small but distinct hook or i\otch at tip 



of upper mandible .... 130 



Part 2. Tip of upper maudibU' not notclied or 



hooked 1-^^ 



Section 2. First primary not short, always mori- thiiii half as 



long as third . . . • • • . 1 •> < 



Part 1 . Tip of upi)er mandible with small but 



distinct hook or notch . . . '•'" 



Part 2. Tip of upper mandible not notclud t)r 



hooked . . . . ^■^'^ 



(1:J1) 



