This section has been already characterized as having a distinctly
notched bill, well provided with bristles. Of the two genera one,
_Perissoglossa_, has the bill slender, acute, something like
_Helminthophaga_, and with the tongue lengthened and much lacerated at
end; the other, _Dendroica_, with less acute bill and tongue shorter,
merely notched at tip, and a little fringed only.