Migration.—Early dates of spring departure are: Perú—Iquitos, March 11. British Guiana—Abary River, March 25. Venezuela—Rancho Grande, April 8. Colombia—Santa Marta Region, May 1. Panamá—Canal Zone, May 12. Costa Rica—San José, May 11. El Salvador—Chilata, April 24. Guatemala—Quiriguá, May 11. Honduras—Tela, May 9. Mexico—Tabasco, Balancán, May 11; Nuevo León, Montemorelos, May 21. Florida—Seven Oaks, May 27. Mississippi—Deer Island, May 25. Louisiana—Chenier au Tigre, May 21. Texas—Kerrville, May 31.
Early dates of spring arrival are: Florida—Pensacola, April 6. Georgia, Athens, April 7. South Carolina—Charleston, April 3. North Carolina—Windsor, April 4. Virginia—Lawrenceville, April 13. District of Columbia—Washington, April 2. Pennsylvania—Wayne, April 4. New York—New York, April 19. Massachusetts—Taunton, April 24. Vermont—Burlington, April 28. Maine—Portland, May 2. New Brunswick—Scotch Lake, May 1. Nova Scotia—Wolfville, May 8. Quebec—East Sherbrooke, May 6. Prince Edward Island—North River, May 6. Newfoundland—St. Anthony, June 5. Louisiana—Avery Island, March 23. Mississippi—Shell Mound, April 1. Arkansas—Tillar, April 5. Kentucky—Eubank, April 12. Indiana—Richmond, April 14. Ohio—Oberlin, April 12. Michigan—Ann Arbor, April 19. Ontario—London, April 20. Missouri—St. Louis, April 15. Iowa—Cedar Rapids, April 20. Wisconsin—Reedsburg—April 27. Minnesota—Minneapolis, April 27. Texas—Victoria, March 28. Oklahoma—Stillwater, April 16. Kansas—Topeka, April 16. Nebraska—Red Cloud, April 21. South Dakota—Faulkton, April 22. Manitoba—Aweme, April 30. Saskatchewan—Regina, May 4. Arizona—Fort Lowell, March 19. New Mexico—Albuquerque, April 24. Utah—Provo, April 25. Colorado—Littleton, April 23. Montana—Fortine, May 1. Alberta—Camrose, May 3. Mackenzie—Simpson, May 21. California—Diablo, March 12. Oregon—Portland, April 17. Washington—Camas, April 5. British Columbia—Comox, April 25; Atlin, May 15.
Late dates of fall departure are: Alaska—Ketchikan, September 6. British Columbia—Atlin, August 26; Chilliwack, September 9. Washington—Destruction Island, September 23. Oregon—Newport, September 18. California—Berkeley, October 10. Alberta—Edmonton, September 1. Montana—Great Falls, September 25. Wyoming—Yellowstone National Park, September 21. Colorado—Fort Morgan, October 2. Arizona—Organ Pipe Cactus National Monument, October 17. Saskatchewan—East End, September 5. Manitoba—Oak Lake, September 18. North Dakota—Fargo, September 19. South Dakota—Aberdeen, September 20. Kansas—Hays, September 23. Texas—Somerset, October 8. Minnesota—Lanesboro, September 10. Wisconsin—Milwaukee, September 20. Iowa—Marshalltown, September 26. Missouri—Bolivar, October 26. Michigan—Grand Rapids, October 8. Ontario—Ottawa, September 29. Ohio—Cleveland, September 30. Illinois—Chicago, September 29. Kentucky—Hickman, September 23. Mississippi—Gulfport, October 20. Louisiana—New Orleans, October 27. Newfoundland—Tompkins, September 9. Quebec—Montreal, September 3. New Brunswick—St. John, September 2. Nova Scotia—Yarmouth, September 11. Maine—Winthrop, September 23. Vermont—St. Johnsbury, September 21. Massachusetts—Stockbridge, October 1. New York—Rochester, October 30. Pennsylvania—Berwyn, October 7. District of Columbia—Washington, October 12. Virginia—Lexington, October 10. South Carolina—Charleston, October 10. Georgia—Milledgeville, October 27. Florida—Fort Myers, October 25.
Early dates of fall arrival are: Louisiana—New Orleans, July 15. Mississippi—Bay St. Louis, July 7. Florida—St. Marks, July 18. Mexico—Sonora, Sáric, July 31; Oaxaca, Tapanatepec, August 20. Honduras—Lancetilla, August 27. El Salvador—Le Unión, August 1. Nicaragua—Bluefields, August 22. Costa Rica—Puerto Limón, August 17. Panamá—Almirante, August 13. Colombia—Bonda, Santa Marta Region, August 27. Venezuela—Cantaura Anzoatique, September 27. British Guiana—Abary River, September 2. Surinam—Paramaribo, August 28.
Banding.—The majority of the banding recoveries indicate the return to the place of banding and give records of longevity. Three birds banded as adults at Wilton, N. Dak., were retrapped at the same station in the following year. One banded at Sioux City, Iowa, on May 17, 1929, was killed by an auto at the same place June 18, 1932. One banded at Sault Ste. Marie, Mich., on May 30, 1926, was retrapped on May 29, 1929; another banded at the same station, May 20, 1928, was killed by an auto June 28, 1934. A yellow warbler banded at North Eastham, Cape Cod, Mass., on May 28, 1931, was retrapped at the same station May 15, 1932, May 18, 1936, and August 6, 1937.
Casual records.—The yellow warbler has twice been collected in Bermuda: November 23, 1875; and October 14, 1903. It has also been observed near Habana, Cuba, on September 3 and 10, 1939. There are three winter records in South Carolina; it was seen at a feeding station at Summerville in the winter of 1939 and on January 21, 1940; and at Charleston on January 18, 1947.
Egg dates.—California: 110 records, April 16 to July 15; 56 records, May 21 to June 19, indicating the height of the season.
Massachusetts: 113 records, May 19 to June 30; 82 records, May 27 to June 7.
Minnesota: 26 records, May 29 to June 23; 17 records, May 29 to June 8.
New Jersey: 32 records, May 15 to June 24; 24 records, May 26 to June 7.