21)? 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. 
353 
Wing, under 3.05; under mandible, yellowish 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 ; 
breast and belly, whitish, faintly tinged with yellow; back, dull olive green. 
Arcadean Flycatcher. 
Empidonas virescens. 
See No. 353. 
Wing, under 3.05; upper parts, tinged with olive brown 3 throat, white; under 
mandible, yellowish white; eye-ring and wing bars, pale tawny. 
Traill’s Flycatcher. 
Empidonax trailli alnorum. 
See No. 354. 
