The prothonotary warbler has been recorded as casual or accidental =west= to southeastern Nebraska (Powell and Lincoln); southeastern South Dakota (Yankton and Sioux Falls); and central Minnesota (Brainerd). =North= to southern Ontario (London and Hamilton); central New York (Ithaca); Massachusetts (Northampton, Amherst, and Concord); New Hampshire (Concord); and Maine (Matinicus Island and Calais). _Winter range._--The winter home of the prothonotary warbler is in Central America and northwestern South America where it has been found =north= to northwestern Costa Rica (Bolson); Nicaragua (Escondido River). =East= to northwestern Venezuela (Mérida and Encontrados); and western Colombia (San José de Cucuta and Villavieja). =South= to southwestern Colombia (Villavieja); and northwestern Ecuador (Esmeraldas). =West= to northwestern Ecuador (Esmeraldas); western Colombia (Antioquia); western Panamá (Paracote and David); and Costa Rica (Puntarenas and Bolson). It has been reported to occur in winter in Campeche and on Cozumel Island, Mexico, and casually or accidentally in Cuba (Habana), Jamaica, and St. Croix, Virgin Islands. _Migration._--The probable route of the prothonotary warbler between its summer and winter homes is across the Gulf of Mexico, from the Yucatan peninsula where it occurs in both spring and fall migration. The casual or accidental occurrences of this warbler in Cuba (Habana); Jamaica; and St. Croix, Virgin Islands, are in migration. Late dates of spring departure are: Colombia--Villavieja, February 5. Panamá; Canal Zone--Barro Colorado, March 10. Nicaragua--Edén, March 23. Quintana Roo--Cozumel, April 6. Cuba--Habana, April 4. Early dates of spring arrival are: Yucatán--Mérida, March 28. Jamaica--Black River, February 28. Cuba--Habana, March 31. Florida--Pensacola, March 18. Alabama--Booth, April 4. Georgia--Fitzgerald, March 21. South Carolina--Yemassee, March 27. North Carolina--Greenville, April 6. Virginia--Suffolk, April 10. Mississippi--Gulfport, March 18. Louisiana--Morgan City, March 10. Texas--Cove, March 28. Arkansas--Huttig, March 31. Missouri--St. Louis, April 17. Kentucky--Bowling Green, April 5. Illinois--Murphysboro, April 17. Ohio--Berlin Center, April 18. Michigan--Grand Rapids, May 3. Iowa--Iowa City, April 26. Wisconsin--Madison, May 2. Minnesota--Red Wing, May 7. Oklahoma--Tulsa, April 2. Kansas--Manhattan, April 26. Nebraska--Blue Springs, April 30.