Buff-banded tyrannulet Mecocerculus hellmayri

Small flycatcher of the subcanopy of humid montane forest at middle elevation of the eastern slope of the Andes from NE Argentina to S Peru. More often heard than seen. Song two high, flat “see” notes, easily confused with Purple-throated Euphonia, but higher and thinner. Often in mixed species flocks. Note greenish wingbars, pale gray cap, and short tail.