54 KEY TO THE BIRDS OF EASTERN NORTH AMERICA, 
FAMILY PHALACROCORACID-E. 
Cormorants. 
' Bill, hooked at tip, and less than twelve inches long ; 
tea bare skin at base of bill and chin; lores, bare; toes, four, 
all connected by webs. 
* Group 1. Wing, 11 to 15 inches long. 
Tail composed of fourteen feathers. 
Phalacrocorax carbo. Common Cormorant. Shag. 
See No. 79. 
Tail composed of twelve feathers. 
Phalacrocorax dilophus, and races. Double-crested Cormorant and Florida Cormorant. 
See Nos. 80 and 81 
The Mexican Cormorant, a smaller species, occasionally occurs in the Mississippi Valley. 
* For directions for measurement, see page 9. 
