TABLE OF CONTENTS. 



Family Colymbidae 1 



^chmophorus occidentalis 1 



Western Grebe 1 



Habits 1 



Distribution 8 



Colymbus Holboelli 9 



Holbcell's Grebe 9 



Habits ^ 9 



Distribution 18 



Colymbus auritus 20 



Horned Grebe 20 



Habits 20 



Distribution 25 



Colymbus nigricollis californicus 27 



American Eared Grebe 27 



Habits 27 



Distribution 34 



Colymbus dominicus brachypterus 35 



Mexican Grebe 35 



Habits 35 



Distribution 39 



Podilymbus Podiceps-^ 39 



Pied-billed Grebe 39 



Habits 39 



Distribution 46 



Family Gaviidse 47 



Gavia immer 47 



Loon 47 



Habits 47 



Distribution 59 



Gavia adamsi 60 



Yellow-billed Loon 60 



Habits 60 



Distribution 64 



Gavia arctica 65 



Black-throated Loon 65 



Habits 65 



Distribution 66 



Gavia pacifica 67 



Pacific Loon 67 



Habits 67 



Distribution 71 



Gavia stellata 72 



Red-throated Loon 72 



Habits 72 



Distribution 80 



XI 



