_Breeding range._--The blue-winged warbler breeds =north= to southeastern Minnesota (Lanesboro); southern Wisconsin (Mazomanie, Prairie du Sac, and Glarus); northeastern Illinois (Rockford, Deerfield, and La Grange); southern Michigan (possibly Hastings, and Ann Arbor); northern Ohio (Toledo, Lakeside, Cleveland, and Austinburg); southern Pennsylvania (Carlisle); southern New York (Ossining and Whaley Lake); and Massachusetts (Springfield and Sudbury). =East= to eastern Massachusetts (Sudbury and Lexington); Connecticut (Westfield and Saybrook); Long Island (Mastic and Oyster Bay); New Jersey (Demarest, Morristown, and Elizabeth); southeastern Pennsylvania (Tinicum and Berwyn); probably occasionally in northern Maryland (Cecil County and Sabillasville); eastern and central Ohio (Canfield and Columbus); east-central Kentucky (Berea); central Tennessee (Nashville and Fall Creek); and central northern Georgia (Young Harris). =South= to northern Georgia (Young Harris, Margret, and Atlanta); northeastern Alabama (Long Island); central Tennessee (Wildersville); and northwestern Arkansas (Pettigrew and Winslow). =West= to northwestern Arkansas (Winslow and Fayetteville); west-central Iowa (Warrensburg); eastern Iowa (Lacey, Grinnell, Winthrop, and McGregor); and southeastern Minnesota (Lanesboro). The blue-winged warbler has occurred in summer west to eastern Kansas (Emporia and Leavenworth); central-southern and eastern Nebraska (Red Cloud, Plattsmouth, and Omaha); western Iowa (Sioux City); and north to Minnesota (Minneapolis); southern Ontario (Point Pelee, Strathroy, and West Lake); central New York (Penn Yan and Auburn); and southern New Hampshire (Manchester). _Winter range._--The principal winter home of the blue-winged warbler seems to be in Guatemala, though it has been recorded in winter from the Valley of Mexico; Puebla (Metlatoyuca); Veracruz (Tres Zapotes); to eastern Nicaragua (Río Escondido and Greytown). There is one winter record each from Costa Rica (Bonilla), Panamá (Port Antonio), and Colombia (Santa Marta Region). On January 6, 1900, a dead blue-winged warbler (apparently dead from starvation) was picked up in Bronx Park, New York. It had only recently died and in all probability was the bird seen on December 10, in the same region. _Migration._--Late dates of spring departure are: Colombia--Santa Marta Region, March 21. Veracruz--Jalapa, April 7. Florida--Pensacola, April 25. Alabama--Guntersville, May 2. District of Columbia--Washington, May 30. Louisiana--Monroe, April 27. Texas--San Antonio, May 12.