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 tbau luilf as long as tliird . . 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 13-1 



Section 2. First primary inore than half as long as third . 13.5 



Part 1. Tip of upper mandible with small but 



distinct hook or notch ... 1 3.') 



Part 2. Tip of upper mandible not notcheil or 



hooked . . . . . .135 



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



long 136 



Section 1. First primarj' 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 ...... 13.s 



(131) 



