﻿RIU1>S 
  OF 
  Nl^AV^ 
  VOl^Iv 
  

  

  Memoir 
  12. 
  N. 
  Y 
  State 
  Museum 
  

  

  Plate 
  5 
  

  

  RING-BILLED 
  GULL 
  

  

  Larus 
  delawareiisin 
  Ord 
  

  

  ADULT 
  IN 
  SUMMER 
  

  

  GREAT 
  BLACK-BACKED 
  GULL 
  

  

  Lai~us 
  marinus 
  Linnaeus 
  

  

  IMMATURE 
  ADULT 
  IN 
  SUMMER 
  

  

  /Smrr^f^i^^-^** 
  m^. 
  

  

  HERRING 
  GULL 
  

  

  Laws 
  aiycntaiHK 
  Bruniiich 
  

  

  IMMATURE 
  ADULT 
  IN 
  SUMMER 
  

  

  GLAUCOUS 
  GULL 
  

  

  Larus 
  glaucus 
  Briinnich 
  

  

  END 
  OF 
  SECOND 
  YEAR 
  ADULT 
  IN 
  SUMMER 
  

  

  tMMATURE 
  

  

  All 
  i 
  nat. 
  size 
  

  

  