Yin TABLE OF CONTENTS. 



Family Laridae — Continued. Page. 



Larus glaucescens 65 



Glaucous-winged gull 65 



Habits 65 



Distribution 73 



Larus kumlieni 73 



Knmlien's Gull 73 



Habits ^ 73 



Distribution 75 



Larus nelsoni 76 



Nelson's Gull— 76 



Habits- 76 



Distribution 76 



Larus marinus 77 



Great black-backed gull 77 



Habits __- 77 



Distribution : 85 



Lainis scbistisagus 86 



Slaty-backed gull 86 



Habits 86 



Distribution 89 



Larus occidentalis 89 



Western gull 89 



Habits 89 



Distribution 98 



Larus fuscus affinis 99 



British lesser black-backed gull 99 



Habits 99 



Distribution 101 



Larus argentatus 102 



Herring gull i 102 



Habits 102 



Distribution "SSSJ~-SZ^-S--. 119 



Larus thayeri .__1_1______ 120 



Thayer's gull 120 



Habits 120 



Distribution 122 



Larus vegae . 122 



Vega gull - 122 



Habits - 122 



Distribution 124 



Larus californicus 124 



California gull 124 



Habits 124 



Distribution 131 



Larus delawarensis 132 



Ring-billed gull 132 



Habits 132 



Distribution 139 



Larus brachyrhynchus 140 



Short-billed gull 140 



Habits 140 



Distribution 145 



Larus canus 146 



