Abstract
1. Nest sites of A. atthis and C. lugubris were surveyed in 3 areas in Kyoto Prefecture mainly from 1974 to 1977.
2. Their nest sites, cliffs were searched mainly along roads and discovered cliffs and nest holes were measured and described.
3. C. lugubris often makes nest holes more than 1000m far from the river but nest holes of A. atthis are seldom found more than 500m far. C. lugubris selects high and pure-sanded cliffs but A. atthis doesn't show these tendencies.
4. The reason why A. atthis doesn't select cliffs good to breed is discussed from the point of view of home range.
