This South American small bird has a black male with two clear white wing bars. Females are browner, and the species feeds mainly on grass seeds.
Adult males have black upperparts, a grayish rump, two white wing bars, white underparts, and a black breast band. The male has a heavy black bill; the female has a brownish bill. Females are dull buffy-olive above and pale below.
It eats seeds of grasses, sedges, and weeds, as well as flowers, buds, and fruits. It occurs in lowland grassy and shrubby areas, forest edges, and second growth.
An extinction-risk assessment has not been added yet.