Halictus parallelus Say 1837

This bee's nest architecture is described by Sakagami and Michener (1962): Nest architecture is Type IIIa: Lateral burrows branch off at approximately right angles from the main burrow with a cell at the end of each. Or nest architecture is Type IIIb: Lateral burrows are very short or absent such that cells are almost attached to the burrow walls at a right angle. The cells are not spatially concentrated in any part of the burrow. Flat ground is the only or typical substrate used for nesting.