ClipArt ETC
"No black cap or white stripe on head. Upper parts dull ashy-blue; under parts sordid or muddy whitish. Cap clear hair-brown. A decided spot white on the middle of the nape, in the brown cap, which on the sides of the head includes the eyes, and is bordered with dusky. Middle tail-feathers like back, without black, and with little or no white." Elliot Coues, 1884

Brown-headed Nuthatch

"No black cap or white stripe on head. Upper parts dull ashy-blue; under parts sordid or muddy whitish.…