Creamy-bellied antwren

The creamy-bellied antwren is about 12 cm (4.7 in) long and weighs about 10.5 to 13 g (0.37 to 0.46 oz). Adult males have a black crown and nape, a white supercilium, a thin black streak through the eye, and white ear coverts. Their back and rump are gray or olive gray with white-tipped blackish scapulars and a small hidden white patch between them. Their wings are black with white tips on the coverts and white edges on the flight feathers. Their central tail feathers are black with small white tips; the rest are black with white tips that are progressively larger to the entirely white outermost pair. Their throat is white or pale yellow buff and their breast and belly pale yellow with a light gray wash on the sides of the breast and flanks. Adult females have a rusty brown forehead and a black streak behind the eye. Their crown and nape are black with white streaks. Their back and rump are olive gray with white-edged blackish scapulars. Their wings are black with white tips on the coverts and pale olive brown or whitish brown edges. Their tail is like the male's. Their throat is white and the rest of their underparts are like the male's. Adults have a brown iris, a black maxilla, a grayish blue mandible, and blue-gray or grayish blue legs and feet.