Plumbeous Vireo (Vireo plumbeus) [XC639628]
by Manuel Grosselet from San Pablo Etla, San Pablo Etla, Oaxaca, Mexico (song)
Plumbeous Vireo (Vireo plumbeus) [XC321325]
by Richard E. Webster from Pinery Canyon, Chiricahua Mountains, Cochise County, Arizona, United States (song)
Subspecies
Probably forms a superspecies with Cassin's Vireo (Vireo cassinii) and Blue-headed Vireo (Vireo solitarius) and the three were formerly treated as conspecific, but molecular-genetic studies indicate that they merit treatment as separate species. Some authorities suggest that southern subspecies notius and montanus may both warrant elevation to rank of full species.
Proposed subspecies jacksoni (south-central Montana) is synonymized with nominate. In Mexico, proposed subspecies pinicolus (described from Mound Valley, in Chihuahua) and repetens (from Tixtla, in Guerrero) likewise treated as synonyms of nominate.
The following 6 subspecies are recognised:
plumbeus Coues, 1866 - Breeds west-central USA (southern Idaho, Wyoming, south-eastern Montana and south-western South Dakota south to eastern California, central Arizona and western Texas) south to south-western Mexico (to Guerrero and south-central Oaxaca). Winters from southern Arizona (rarely) south through western Mexico.
gravis Phillips, AR, 1991 - Breeds east-central Mexico (northern and western Puebla, probably north-eastern Hidalgo). Winters also south to south-eastern Veracruz.
notius van Tyne, 1933 - Belize.
montanus van Rossem, 1933 - Southern Mexico (extreme south-eastern Oaxaca, Chiapas) south to Honduras.
pinicolus van Rossem, 1934 - Mountains of north-western Mexico (Sonora to Durango and Zacatecas).
repetens van Rossem, 1939 - Oak-pinyon-juniper belt of central Mexico.
BirdLife International Species Factsheet