Jan., tqoq. Birds of Illinois and Wisconsin — Cory. 



i6i 



Family CUCULID.^. Cuckoos. 



Feet, zygodactyle (two toes in front, two behind) ; first primary, 

 about half as long as third ; outer tail feathers, much shorter than 

 middle ones. 



Yellow-billed Cuckoo. 



U|)]jer parts, ^)r<)^vnish i^ray, with faint gloss of greenish; under 

 mandible, mostly yellow ; greater portion of primaries, rufous brown, 

 tipped with grayish oHve; under [)arts, dull white; outer tail feathers, 

 l^lack, tipped with white. Coccyzns anien'caiins. 



Yellow-billed cuckoo. 

 See No. 185. 



Upper parts, grayish brown, with faint gloss of green; bill, black; 

 no rufous brown on primaries; tmdcr parts, dull white; outer tail 

 feathers, like back in color. Coccyzns ervtlirophthalinus. 



Black-billed Cuckoo. 

 See No. 186. 



