20-2 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Group 3. Wing, 2.75 to 3.25 inches long. 



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

 black bristles at base. 



Wing, undei- 3.05 ; under mandible, yellowisli white ; throat and underparts, 



pale greenish yellow ; back, olive green. 



Yellow-bellied Flycatcher. 



Empidonax flaviventris. 



See No. 352. 



Wing, usually under 3.05; under mandible, yellowish white; throat, white ; 



Ijreast and belly, whitish, faintly tinged with yellow; back, dull olive green. 



Arcadean Flycatcher. 



Em-pidonax rlrescenn. 

 See No. 353. 



Wing, under 3.05 ; upper parts, tinged with olive brown ; throat, white ; under 

 inandihle, yellowish white; eye=ring and wing bars, pale tawny. 



Traill's Flycatcher. 



Empidonax trailli alnorum. 

 See No. 354. 



