Rufous-capped Warbler (Basileuterus rufifrons) [XC694354]
by Manuel Grosselet from Xuchapa, Iz\u00facar de Matamoros, Puebla, Mexico (call, song)
Rufous-capped Warbler (Basileuterus rufifrons) [XC494224]
by id from Parque Estatal Cerro Punhuato, Mexico (call)
Subspecies
Subspecies form two groups, the "yellow-bellied group" group (delattrii, mesochrysus and actuosus), occurring southern from southern Guatemala, and "white-bellied group" (remaining five races), from Mexico to central Guatemala and Belize. Groups sometimes treated as two separate species, with some vocal differences, but they apparently interbreed extensively in Guatemala, and possibly also in extreme southern Mexico (south-eastern Chiapas), El Salvador and Honduras. Subspecies salvini intermediate in plumage between the two groups, also linking them geographically.
The following 8 subspecies are recognised:
caudatus Nelson, 1899 - North-western Mexico (Sonora and western Chihuahua south to northern Durango).
dugesi Ridgway, 1892 - Central Mexico (southern Sinaloa and western Durango south to southern Puebla and western Oaxaca).
jouyi Ridgway, 1892 - North-eastern Mexico (Nuevo León and western Tamaulipas south to eastern Hidalgo and central Veracruz).
rufifrons (Swainson, 1838) - Highlands of southern Mexico and central Guatemala.
salvini Cherrie, 1891 - Southern Gulf slope in southern Mexico (southern Veracruz, northern Oaxaca), northern Guatemala and southern Belize.
delattrii Bonaparte, 1854 - Southern Guatemala (probably also extreme south-eastern Chiapas, in adjacent Mexico) south to central Costa Rica.
mesochrysus Sclater, PL, 1860 - Southern Costa Rica south to northern Colombia and extreme western Venezuela.
actuosus Wetmore, 1957 - Coiba I, off southern Panama.
BirdLife International Species Factsheet