200 



KEY TO THK BIRDS OF EASTERN NORTH AMERICA. 



FAHILY TYRANNID/E. 



Flycatchers. 

 Group 1. Wing, from 2.13 to 2.37 inches long. 



Bill, broad and flattened, with numerous small black bristles at base ; 

 tip, with small but distinct hook. 



353 



Top of bill. Side of bill. 



Bill, with small hook at tip, flat and wide at 

 base; back, olive green; belly, not yellow, 



or only faintly tinged with yellow. 



Least Flycatcher. 



Empidonax minimus. 

 See No. 355. 



Back, olive green; belly, clear yellow. 



Yellow-bellied Flycatcher. 



Empidonax flaviventris. 

 See No. 352. 



Group 2. Wing, 2.37 to 2.75 inches long. 



Under mandible, yellowish white ; throat, whitish ; breast and belly, dull white, 

 tinged with pale yellow; back, olive green. 



Arcadian Flycatcher. 

 Green-crested Flycatcher. 



Empidonax virescens. 

 See No. 353. 



