_a._ Crown nearly like the back.
Above olive-gray, rump more virescent; crown more ashy.
Beneath dingy whitish, with a strong tinge of dingy buff
from bill along sides and across breast. Bill, .14 deep,
.30 long; wing, 2.85; tail, 2.05. _Hab._ Eastern Province
of United States … var. _gilvus_.
Similar, but above more grayish, and beneath with the buff
tinge almost absent. Bill, .11 deep, and .22 long; wing,
2.80; tail, 2.15. _Hab._ Western Province of United States …
var. _swainsoni_.
_b._ Crown very different from the back (dark brown).
Above olive-brown; rump more virescent; crown dark
snuff-brown. Beneath uniform light yellow, throat whitish.
Bill, .15 deep, .30 long; wing, 2.60; tail, 2.10. _Hab._
Middle America, from Ecuador to Honduras … var. _josephæ_.[75]
Vireosylvia calidris, var. barbatulus, BAIRD.