This species is part of the subgenus Sphecodogastra, treated as a genus in the review of McGinley (2003). Forages for pollen from the Antioch Dunes evening-primrose (Oenothera deltoides, Onagraceae). Both the bee and the primrose are restricted to the Antioch Dunes, Contra Costa county CA (McGinley 2003). Unlike other related females that plug the nest entrance when they leave to forage, L. antiochense sometimes leaves a guard bee at the nest entrance instead. This, combined with the restricted foraging period, may reduce brood parasitism (McGinley 2003). Like other bees of the Sphecodogastra group of Lasioglossum, these bees are generally solitary, but with some aspects of social behavior. Females return to their natal nest to overwinter, often with other females. This species may be communal. Guard bees have been observed at nest entrances while another female is foraging, and long established nests may contain many females (McGinley 2003). These bees generally excavate their nests in stabilized sand in open xeric areas (McGinley 2003). Nests occur in aggregations, with up to seven per square meter (McGinley 2003). Species distribution: Lasioglossum antiochensis only occurs in the sand dunes of Antioch, Contra Costa county, CA, USA, as does its pollen source, Oenothera deltoides howellii (McGinley 2003).Females fly between March and August, but primarily in May. Males fly from May to October, but primarily in June (McGinley 2003).
