INDEX TO KEY TO FAMILIES. 



LAND BIRDS. 



PAGE 



Group 1. Birds having wings less than 1.75 inches long . ,133 



Group 2. Birds having wings from 1.75 to 2.75 inches long . .133 

 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. Upper mandible without notch or hook 



at tip 134 



Section 2. First primary more than half as long as third . 135 

 Part 1. Tip of upper mandible with small but 



distinct hook or notch . . .135 

 Part 2. Tip of upper mandible not notched or 



hooked ' 135 



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



long . '-;, . . . . . . . . . 136 



Section 1. First primary less than half as long as third . 136 

 Part 1. A small but distinct hook or notch at tip 



of upper mandible . . . . 136 



Part 2. Tip of upper mandible not notched or 



hooked .' . . . 137 



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



long as third . . . . . 137 



Part 1. Tip of upper mandible with small but 



distinct hook or notch . . . 137 



Part 2. Tip of upper mandible not notched or 



hooked . . . . . 138 



(131) 



