This swallow has a black chest band against a white belly. A study along a river in southeastern Brazil recorded it nesting in rock cavities.
Adults have blue-black upperparts, a white underside with a narrow black band across the throat and chest, and a long forked tail.
At the study site on the Paraopeba River in southeastern Brazil, birds nested in cavities in exposed rocks in a rocky riverbed and caught flying insects over rapids and small cascades.
An extinction-risk assessment has not been added yet.