188 KEY TO THE BIRDS OF EASTERN NORTH AMERICA, 
FAMILY CUCULID-. 
Cuckoos. 
Feet, zygodactyle (two toes in front, two behind). 
Under mandible, yellow ; greater portion of primaries, rufous brown, tipped 
with grayish olive; underparts, dull white; outer tail feathers, black, tipped 
with white. 
Yellow-billed Cuckoo. 
Coceyzus americanus. 
See No. 320. 
Under mandible, yellow, tip, black: primaries, grayish olive, not rufous 
brown; belly, tinged with pale rufous. 
Mangrove Cuckoo. 
Coccyzus minor, and races. 
See No. 318. 
Bill, black ; no rufous brown on primaries; underparts, dull white; outer tail, 
like baek in color. 
Black=billed Cuckoo. 
Coccyzus erythrophthalmus. 
See No. 321. 
General plumage, black 5 bill, black. West Indian species, recorded from Florida ; 
accidental in the United States. Bill very different from that of true Cuckoo, 
being thin and ‘* Parrot like.” Ani. 
Crotophaga ani. 
See No. 317. 
