Winter range.—In winter Virginia’s warbler is found in west central Mexico from northern Jalisco (Bolanas); and Guanajuato (Guanajuato), to Morelos (Yautepec); and Guerrero (Talpa and Chilpancingo).
Migration.—A late date of spring departure is: Sonora—Moctezuma, May 10.
Early dates of spring arrival are: Texas—Socorro, April 20. New Mexico—Cooney, April 10. Colorado—Estes Park, May 2. Arizona—Madera Canyon, Santa Rita Mountains, April 2. Utah—Vernal, May 5. Nevada—South Twin River, April 30.
Late spring migrant in Brewster County, Tex., May 13.
Late dates of fall departure are: Utah—Vernal, September 20. Arizona—Tombstone, September 11. Colorado—Boulder, September 21. New Mexico—Koehler Junction, September 11. Texas—El Paso, September 16.
Early dates of fall arrival are: Arizona—Toprock, July 23. Texas—Toyavale, August 21. Sonora—Guadalupe Canyon, August 31.
Casual records.—Two specimens of Virginia’s warbler have been taken in western California: in San Diego County, on September 3, 1931; and at Prisoner’s Harbor, Santa Cruz Island, on September 8, 1948. Virginia’s warbler has been reported as occurring in Nebraska and Kansas, but there is no record of a specimen having been taken in either State.
Egg dates.—Arizona: 10 records, May 17 to June 21; 5 records, May 25 to June 4.
Colorado: 6 records, June 1 to 26.
Nevada: 3 records, June 8 to 15.