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We conducted field work during May-July 2005 in the Mexican states of Nuevo Leon, Tamaulipas and San Luis Potosi. We observed breeding activity of Black-capped Vireos and found active nests in northwestern Nuevo Leon and southwestern Tamaulipas. These findings represent the first documented nests for those states, and for the latter state, the first records of Black-capped Vireos nesting below the Tropic of Cancer. Our findings suggest that the breeding range of Black-capped Vireos should be extended approximately 520 km to the southeast of the previous known nesting area near Ocampo, Coahuila. Received 25 June 2013. Accepted 6 September 2013. Key words: Black-capped Vireo, breeding, Mexico, nests., The Black-capped Vireo (Vireo atricapilla) is classified as a vulnerable species internationally (BirdLife International 2013), and as Endangered by the U.S. Fish and Wildlife Service (Ratzlaff 1987), Texas Parks and [...]