Mining bees, or digger bees, (familys Andrenidae & Anthophoridae) nest in burrows in the ground. Each mining bee female usually digs her own individual burrow to rear her own young. Large numbers of these bees may nest near one another if soil conditions are suitable.
GalleriesHymenoptera: Ants Bees and Wasps
Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)