Plate IY. 









Fi^. 1 Herring Gull, Lams argentatux. Brunnioh. 



.. 2. I,.iugl)ing Gull, CJiroicocepha/iis atririlla. I.in 



,. 3 \\.\t{\\yakKG\\\\, Hissa triiJac:ijla. Bonaparte. 



., 4 Wilson's Tern, 5/e?-wa Wilsonii. ronapartc. 



,, 5. -\.>':\ft Tern. Sterna frcnntn. Gambol. 



