ItlUDH OK NKAV V O U Iv 



Memoir 12. N. Y. State Museum 



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if 



Plate 5 



RING-BILLED GULL „ , 



Linus (ic(<ti('i(i-tii»ix Oril 



ADULT IN SUMMER IMMATURE 



GREAT BLACK-BACKED GULL 



Ldrus inanuiU'< Linnaeus 



IMMATURE ADULT IN SUMMER 



HERRING GULL 



/.iinw (iiytnlahi.i Brtlimieh 



IMMATURE ADULT IN SUMMER 



GLAUCOUS GULL 



Ldi'M.i (/Iniiiw Brilnnicli 



END OF SECOND YEAR ADULT IN SUMMER 



IMMATURE 



All I nat. sizo 



