Rather drab warbler of highlands in Mexico. Breeds in oak scrub and thickets in pine-oak areas of mountains. Winters in brushy flower banks and tangles within pine-oak forests. Sings from atop bushes and small trees, but otherwise rather skulking, generally staying low and well hidden and does not join mixed-species feeding flocks. Dusky gray-brown overall with grayer head, bold white eyering, buffy flanks, and mustard-yellow patch under the tail.