Appearance
The plumage differences between ''chlorophrys'' and ''chrysogaster'' are less than those between many taxa currently treated as the same subspecies in ''Myiothlypis''. The vocal differences are also weakly documented.
Distribution
The golden-bellied warbler has a disjunct distribution, with the subspecies ''M. c. chlorophrys'' in the Choco along the Western Andes from central Colombia to central Ecuador, and the nominate ''M. c. chrysogaster'' in the Eastern Andes from central to southern Peru. It has been proposed that ''chlorophrys'' is a separate species, the Choco warbler ''M. chlorophrys'', but it is very similar in plumage to nominate ''chrysogaster'', differing primarily in having a mostly olive, not yellow, superciliary, with the yellow restricted to the anterior-most portion.References:
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