The Phcebe also is the larger bird, and both of its mandibles are black, while the lower 

 mandible of the Pewee is lighter than its upper one. The Pewee nests in trees. 



A characteristic habit common to both of these birds is that of drooping wings and 

 tail as they perch, presenting a languid appearance quite in keeping with the lugubrious 

 tone of their note. Let an unwary fly approach, however, and this lassitude quickly 

 vanishes. A lightning dart with unerring aim, a snap of the beak audible at a distance of 

 several yards ; a twist, almost a somersault in the air, is made, the bird regains his station 

 and resumes his despondent attitude, and there is one less insect abroad. 



PLATE XV. YELLOW-BELLIED FLYCATCHER. 



Empidonax flavi-ventris. 



Head and body, above olive-green ; beneath greenish-yellow, except 

 on the belly, where the yellow is pure ; a yellowish ring encircles the 

 eye ; wings brown with yellowish bands ; tail brown, square ; bill 

 broad, the upper mandible dark brown, the lower one pale. Length, 

 5.60 inches. 



Migratory. This Flycatcher does not nest here. It is rather abundant, however, 

 when on its migrations, and may be seen during the last three weeks of May ; and, again, 



