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Black-throated Grey Warbler Dendroica nigrescens
This species only winters as far as the Isthmus of Tehantepece in Mexico. The only record for our region, that I am aware of, was seen at Dueñas in Guatemala on the first of November 1936 (Wetmore,1941, cited in Land). Wetmore, A. (1941) Notes on birds of the Guatemalan highlands. Proc. U.S. Natl. Mus., 89: 523-581.