Grey-crowned Yellowthroat (Geothlypis poliocephala) [XC880120]
by Juan Carlos P\u00e9rez Maga\u00f1a from Santa Ana, Pet\u00e9n, Guatemala (song)
Grey-crowned Yellowthroat (Geothlypis poliocephala) [XC864656]
by Peter Boesman from Road below Cerro Lodge, Puntarenas, Costa Rica (call)
Subspecies
Often placed in a monotypic genus, Chamaethlypis. Differs from present congeners in many characters, including vocalizations, morphology and some plumage features. Geographical variation not very marked and mostly clinal, birds becoming more olive above, deeper and more extensively yellow below, darker grey on head and with less obvious eye-crescents from north to south.
Proposed subspecies pontilis (described from Morelos, in southern Mexico) is synonymized with nominate.
The following 6 subspecies are recognised:
poliocephala Baird, 1865 - Pacific slope of Mexico from northern Sinaloa south to extreme western Oaxaca.
ralphi Ridgway, 1894 - Gulf slope of Mexico in Tamaulipas and San Luis Potosí.
palpebralis Ridgway, 1887 - Eastern slope from eastern Mexico (Veracruz) and Yucatán Peninsula south to northern Costa Rica.
caninucha Ridgway, 1872 - Pacific slope from southern Mexico (eastern Oaxaca) south to southern Honduras.
icterotis Ridgway, 1889 - Pacific slope from Nicaragua south to western Costa Rica.
ridgwayi (Griscom, 1930) - South-western Costa Rica south to south-western Panama.
BirdLife International Species Factsheet