(CHOUN ICIS oy 
TITLEPAGE . : ; , : : ; : : ‘ P 
DEDICATION ; : : ‘ : ; : : ‘ ; 
PREFACE ; : ; 5 ; : : ; : F F 
ContrENTS . F : : ; : : ; ’ 
GLOSSARY. ' : : : ; . : : : ; 
ToroGcrapny or A Birp 
INTRODUCTION , : : : : , : z 2 
How To Measure a Birp . : s ; : : : ; 
INDEX TO Key To FAmiLties. Water Birps : ; 3 : 
GRoUP 
Group 
GRoUP 
Group 
GROUP 
Group 
KKry TO 
1. Toes, four, with lobate webs, or webs on sides of toes 
2. Toes, four; front toes, palmate (full webbed) ; hind toe not 
nected with front ones by web . : é : 
con- 
. 
3. Toes, four, full webbed; hind toe connected with front ones by 
web : 2 : : é : : : , 
4. Toes, four, not full webbed; small webs between toes at base, or 
toes entirely without web ; : P : ; 
Section 1. Hind toe, raised above level of front toes 
Section 2. Hind toe, on level with front toes 
5. Toes, three, full webbed; no hind toe ; ‘ F 
6. Toes, three; a small web between toes, or entirely without web 
THE SPECIES OF WatTeER Birps or EAstern NortH AMERICA 
FamiLy Popicirip®. GREBES . : i : : 
Famity Gavup#. Loons . , : : ; 2 : : 
Famity Atcip2. AvuKS, PUFFINS, AND MURREs . ; : ; 
FamiILty STERCORARIIDE. SKUAS AND J.ZGERS f y ; ! 
Famity LAarip#. GuwuLis AND TERNS . : : ; : g 
SUBFAMILY LAaRIN@. GuwULLS : : ? : : : ‘ 
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