Breeding range.—The yellow-throated warbler breeds north to northern Illinois (Knoxville, Hennepin, Saint Charles, and possibly Waukegan); northern Indiana (Elkhart and Waterloo); northern and eastern Ohio (Wauseon, Sandusky, Cleveland, and Cadiz); northern West Virginia (Doddridge County); northern Maryland (Baltimore); and southern Delaware (Seaford and Frankford). Its occurrence, without indication of breeding has been reported north to Sigourney, Iowa; Lake Koshonong and Racine, Wis.; Kalamazoo, Battle Creek, and Detroit, Mich.; Frankfort Springs and Narberth, Pa.; Mamaroneck, N. Y.; Hartford, Conn.; and Dedham, Mass. East to southeastern Delaware (Frankford); and the Atlantic coast to central eastern Florida (Titusville). South to south-central and western Florida (Titusville, Bassinger, Punta Rossa, Tarpon Springs, St. Marks, and Pensacola); the Gulf coast of Mississippi and Louisiana to eastern and central Texas (Port Arthur, Houston, Brazoria County, San Antonio, and Ingram). West to eastern Texas (Ingram, Austin, Waco, Rhome, and Gainesville); central Oklahoma (Dougherty, Oklahoma City, and Ponca City); southeastern Kansas (Neosha Falls), central Missouri (Columbia); and western Illinois (Knoxville).
The territory as outlined is occupied by two geographic races: the eastern yellow-throated warbler (D. d. dominica) breeds from Maryland southward and east of the mountains; the sycamore yellow-throated warbler (D. d. albilora) breeds from the mountains westward.
Winter range.—The two races appear not to mingle in winter. The yellow-throated warbler winters north to northwestern Florida (Pensacola and St. Marks); and casually to southern Georgia (Thomasville and Brunswick). East to southeastern Georgia (Brunswick); the Bahamas (Watling and Great Inagua Islands); Dominican Republic (Samaná); Puerto Rico; and St. Thomas; casually to Montserrat. South to Montserrat, casually; Haiti (Port au Prince); and Jamaica. West to Jamaica; Grand Cayman; western Cuba (Isle of Pines and Habana); and western Florida (Pensacola).
The sycamore warbler winters regularly north to southern Sinaloa (Mazatlán); Nayarit (Tepic); southern Veracruz (Tlacotalpan); Yucatán (Progreso); and Quintana Roo (Cozumel Island). East to Quintana Roo (Cozumel Island and Xcopén); British Honduras (Belize); central northern Honduras (Ruatán Island and Puerto Castilla); southeastern Nicaragua (Greytown); and central Costa Rica (San José and Cartago). South to Costa Rica. West to western Costa Rica (Cartago); western Guatemala (Dueñas and Totonicopán); western Guerrero (Acapulco); western Michoacán (Coahuayana); Colima (Colima); and southwestern Sinaloa (Mazatlán). It also winters in small numbers in Cameron County, Tex.
Migration.—Late dates of departure from the winter home are: Puerto Rico—Ponce, February 26. Haiti—Île à Vache, April 29. Cuba—Cienfuegos, April 15. Bahamas—New Providence, April 15. Veracruz—Tres Zapotes, March 25.
Early dates of spring arrival are: Alabama—Greensboro, March 10. Georgia—Augusta, March 2. South Carolina—Columbia, March 23. North Carolina—Raleigh, March 13. Virginia—Lawrenceville, March 19. District of Columbia—Washington, March 24.
Late dates of fall departure are: Ohio—Toledo, September 28. Indiana—Bloomington, October 9. Missouri—St. Louis, October 11. Kentucky—Bowling Green, October 5. Tennessee—Nashville, October 3. Arkansas—Helena, October 10. Mississippi—Biloxi, October 12. Louisiana—Monroe, October 16. Texas—Brownsville, October 8. District of Columbia—Washington, September 27. Virginia—Lynchburg, October 6. North Carolina—Chapel Hill, October 6. Georgia—Athens, October 11.
Early dates of fall arrival are: Bahamas—Nassau, July 26. Cuba—Guantánamo, July 11. Jamaica, August 16. Dominican Republic—Monte Viejo, August 26. Puerto Rico—Fortuna, August 28. Mexico—Chiapas, Ocote, August 13. Guatemala—San Lucas, August 7. Honduras—Truxillo, September 26. Costa Rica—San José, September 17.
Casual records.—A number of specimens of the sycamore warbler have been taken on the Atlantic seaboard.
Egg dates.—Florida: 11 records, April 17 to June 9; 7 records, April 20 to 29.