Torchio et al. (1967) described 25 nests collected at Newton Dam, Cache Co., UT, USA. The nests were burrowed into a 55 degree embankment with no vegetation. The nests were in an aggregation. Pollen use: pollen and nectar were collected from the plant Phacelia leucophila which was growing near the nesting site. The nest burrows were 3-5 cm deep. Lateral burrows branching off from the main burrow were 4 to 42 mm long and terminated at cells 5 to 10 cm below the surface. The lateral burrows were plugged after the brood cell was closed. About 25% of the lateral burrows contained two cells in a linear series (that is, filling up the burrow) rather than just one cell. Adults foraged from 8:30 am to 1:30 pm local time. There was no indication of multiple females in the nest; the species is apparently solitary. Natural enemies: ten percent of cells were parasitized by the cuckoo bee Neopasites sp. (Anthrophoridae).
