Confusing fall warbler

September 29.

Saw a warbler in Potter's Swamp, light-slate head and above and no bars on wings; yellow all beneath, except throat, which was lighter ash, and perhaps upper part of breast; a distinct light ring about eye, iris-like; light bill, and apparently flesh-color legs, etc. Very inquisitive, hopping within ten feet, with a chip. It is somewhat like the Nashville warbler.

H. D. Thoreau, Journal, September 29, 1859

September 29, 2019

Saw a warbler in Potter's Swamp, very inquisitive, hopping within ten feet, with a chip. Compare September 24, 1854 ("See a warbler which inquisitively approaches me creeper-wise along some dead brush twigs. It may be the pine-creeping warbler, though I see no white bars on wings. I should say all yellow olivaceous above; clear lemon-yellow throat and breast; narrow white ring around eye; black bill, straight; clay-colored legs; edge of wings white.") See also  May 3,1857 ("Emerson says that Brewer tells him my "night warbler" is probably the Nashville warbler."); September 11, 1857 ("On the east edge of Dennis Swamp, where I saw the strange warbler once. ")