The band-tailed antwren (Myrmotherula urosticta) is a Vulnerable species of insectivorous bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

[2][1] The band-tailed antwren was described by the English zoologist Philip Sclater in 1857 and given the binomial name Formicivora urosticta.

Their throat is white, their sides and flanks gray, and the rest of their underparts pale cinnamon-buff.

It found very spottily and locally in coastal eastern Brazil between Bahia and northern Rio de Janeiro state.

It appears to favor tall forest on sandy soil, especially those with abundant vines in their lower reaches.

It forages singly, in pairs, or in family groups, and usually as part of a mixed-species feeding flock.

The band-tailed antwren's song is a "short series of 4-5 very high, nasal, well-separated, sharply upslurred 'tjeuwi' notes".