107. The Blue-grey Warbler (Sylvicola cærulea) 108.
The Blue Yellow-backed Warbler (Sylvicola americana) 109. The Black-throated Blue Warbler (Sylvicola canadensis) illustration from Zoology of New York (1842–1844) by James Ellsworth De Kay. Original from The New York Public Library. Digitally enhanced by rawpixel.