_Winter._--By the last of August or early September, Virginia's warblers have retired from their northern breeding haunts, to spend the winter in southern Mexico. Dr. C. William Beebe (1905) writes: "Occasionally in the mornings, numbers of tiny grayish warblers came slowly down the walls of the _barranca_, feeding as they descended, taking short flights, and keeping close to ground among the dense underbrush. These birds lingered at the camp for a time, and then, with soft, low chirps, all passed on to the water, where they alighted on the sand and drank. Then, as if at some silent signal, all flew up and returned quickly, still keeping close to the ground, zig-zagging their way upward in a long line, like tiny gray mice." These were, of course, Virginia's warblers. DISTRIBUTION _Range._--Western United States to Southern Mexico. _Breeding range._--Virginia's warbler breeds =north= to central eastern California (White Mountains); central and northeastern Nevada (Kingston Creek, Ruby Mountains, and East Humboldt Mountains); northern Utah (Salt Lake City, Parley's Park, Packs Canyon, and Ashley); possibly southeastern Idaho (Joe's Gap, Bear Lake County; one specimen from Bancroft, Bannock County); and northern Colorado (probably Little Snake River, Moffat County, and Estes Park). =East= to the eastern slope of the Rocky Mountains in Colorado (Estes Park, Denver, Manitou, Fountain, and Beulah); in migration has occurred east to Limon, and Monon in Baca County close to the Kansas line; and central New Mexico (Tierra Amarilla, Lake Burford, Sandia Mountain, and Apache, probably). =South= to southwestern New Mexico (Apache); and southeastern Arizona (Paradise and the Huachuca Mountains). =West= to southeastern and central Arizona (Huachuca Mountains, Santa Catalina Mountains, and Prescott); and eastern California (Clark Mountain and White Mountains; casually in migration to Lemon Grove). _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.