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The Plumbeous Seedeater and Black-masked Finch can be distinguished by their facial markings and bill color. The Plumbeous Seedeater typically lacks the bold facial pattern of the Black-masked Finch, which features a striking black face with a white supercilium and a bicolored orange and black bill.

Look for the black face and white supercilium of the Black-masked Finch, along with its bicolored orange and black bill. In contrast, the Plumbeous Seedeater lacks these bold facial features.

The Plumbeous Seedeater generally has a more uniform plumage, while the Black-masked Finch displays a distinctive black face with a contrasting white supercilium and olive-green upperparts.

The Black-masked Finch is found in tall grasslands with interspersed shrubs or palms, while specific habitat preferences for the Plumbeous Seedeater are not detailed here.

The Black-masked Finch has a high-pitched, insect-like song consisting of closely spaced paired notes.