empidonax

from The Century Dictionary.

• noun A large genus of small American olivaceous flycatchers, of the family Tyrannidæ, inhabiting North, Central, and South America, having the bill and feet moderate in length among allied genera, of mean length among related flycatchers, the wings pointed, the tail emarginate, and the plumage mostly dull-greenish.
• noun Four species are very common woodland migratory insectivorous birds of the eastern United States: the Acadian flycatcher, E. acadicus; Traill's, E. trailli; the least, E. minimus; and the yellow-bellied, E. flaviventris.