The bold white spectacles of the Plumbeous Vireo are a good field mark. Blue-headed and Cassin's Vireos have contrast between the gray head and the more olive back and yellower flanks. Black-capped Vireo also has white spectacles but it has a black, not gray, head. Yellow-throated and White-eyed Vireos have yellow spectacles. The Gray Vireo is similar but it lacks spectacles and has faint wing bars.