A rather dark swallow of the Andean highlands from Venezuela to Bolivia. Head and back are dark iridescent blue. Throat and belly are dusty grayish-brown. Tail is relatively long with a deep fork. Flocks are found over forest and clearings, especially around nesting sites on cliffs and landslides. Occurs from 2,500-4,000m, often higher than Blue-and-white Swallow but plenty of overlap.