Late dates of spring departure are: Mexico, city of Mexico, May 19; Guerrero, Iguala, June 1; Ohio, Youngstown, June 2; Michigan, Detroit, May 24; Iowa, Sioux City, June 6; Texas, San Angelo, May 15, and Ingram, May 26; Kansas, Wichita, May 20; Nebraska, Neligh, May 26, and Valentine, May 30; South Dakota, Vermilion, May 24, and Sioux Falls, June 11; North Dakota, Charlson, May 22, and Jamestown, June 4; Saskatchewan, Indian Head, June 2, and Quill Lake, June 16; Wyoming, Yellowstone Park, June 3; Alberta, Fort Chipewyan, June 1; and British Columbia, Okanagan Landing, May 10, Vaseaux Lake, May 18, and Sumas, May 19. _Fall migration._--Early dates of fall arrival are: British Columbia, Okanagan Landing, July 7; Washington, Wrights Peak, July 21, Blaine, August 4, and Tacoma, August 6; California, Santa Barbara, July 25; Lower California, San Jose del Cabo, September 3; Alberta, Strathmore, July 31; Wyoming, Toltec, July 27; Colorado, Denver, July 21, Boulder County, July 27, and El Paso County, July 29; Saskatchewan, Maple Creek, July 17; Manitoba, Oak Lake, July 12, and Red Deer River, July 23; South Dakota, Forestburg, July 25; Nebraska, Callaway, August 4, and Lincoln, August 9; Texas, San Angelo, July 20; Ontario, Toronto, July 28; Michigan, Charity Island, July 9; Ohio, Bay Point, July 3; Illinois, Chicago, July 2; Massachusetts, Monomoy Island, July 14; New York, Montauk, August 14, Locust Grove, August 18, Onondaga Lake, August 27; Pennsylvania, Beaver, August 21, Erie, August 22; Mexico, Zacatecas, August 16, Colonia Garcia, September 4, and Janos River, September 5; and Patagonia, Arroyo Seco, Rio Negro, September 6, and Huanuluan, September 12. Late dates of fall departures are: Alaska, Point Barrow, September 4; British Columbia, Comox, September 15, and Okanagan Landing, October 18; Washington, Tacoma, September 27; Oregon, Netarts Bay, September 12; California, Monterey, October 24; Colorado, Boulder County, September 25, and Barr, October 5; Saskatchewan, Indian Head, September 21; Manitoba, Oak Lake, September 5, and Shoal Lake, September 14; North Dakota, Charlson, September 21; Nebraska, Valentine, October 10, and Lincoln, November 3; Kansas, Lawrence, October 26; Texas, Tom Green and Concho Counties, October 20; Iowa, Burlington, October 2, and Keokuk, October 14; Ontario, St. Thomas, October 3, Toronto, October 10, and Plover Mills, October 20; Ohio, Painesville, October 11, and New Bremen, October 28; Illinois, Chicago, October 2; Missouri, Independence, October 13; Maine, Warren Island, September 20, and Bangor, November 1; Massachusetts, Cambridge, October 30; Connecticut, West Haven, October 28, and Stratford, November 3; New York, Shinnecock Bay, October 31, and Canandaigua, November 20; and Pennsylvania, Erie, October 6.