Description wikipedia

The black-bellied antwren (Formicivora melanogaster) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia, Brazil, and Paraguay. The black-bellied antwren is 12 to 14 cm (4.7 to 5.5 in) long. Adult males of the nominate subspecies have a wide white supercilium that extends down the neck, along the side of the breast, and widens on the flanks. Their crown and upperparts are dark grayish brown with white edges on the outer scapulars and a hidden white patch between them. Their wings are blackish with white tips on the coverts. Their tail is black with white feather tips that increase in size from the central to the outer feathers. Their face, throat, and underparts are black with white underwing coverts. Adult females have a browner crown and back than males with little or no white between the scapulars. They have a wide black band through the eye, a white throat, and white underparts with a faint buff tinge. Males of subspecies F. m. bahiae have a wider white line between the supercilium and the breast, paler upperparts, and smaller white spots on the tail than the nominate. Females are the same as the nominate.