The range as outlined is divided into several subspecies or geographic races. The Newfoundland warbler (_D. p. amnicola_) breeds from central western Alaska south to central British Columbia, central Alberta, Saskatchewan and Manitoba, central Ontario and Quebec northward and east to Newfoundland; the Alaska yellow warbler (_D. p. rubiginosa_) breeds in the coastal region of southern Alaska; the Rocky Mountain yellow warbler (_D. p. morcomi_) breeds from southern British Columbia and Washington east through the Rocky Mountains south to northern Nevada, northern Utah and northern New Mexico; the California yellow warbler (_D. p. brewsteri_) breeds west of the Sierras in Oregon and California; the Sonora yellow warbler (_D. p. sonorana_) breeds from southeastern California, southern Nevada, and southern New Mexico to northwestern Mexico and western Texas; the eastern yellow warbler (_D. p. aestiva_) breeds from southern Canada east of the Rocky Mountains southward. The Cuban golden warbler (_D. p. gundlachi_) which is resident in Cuba, the Isle of Pines, and adjacent Cays has been found nesting on Bay Key, Fla. The mangrove, or "golden," yellow warbler (_D. p. castaneiceps_) breeds on both coasts of Baja California from about latitude 27° 14´ N. (San Lucas) southward; and on the west coast of Mexico from southern Sonora (Guaymas) south to Nayarit (San Blas). (Apparently it is only slightly migratory, if at all.) _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.