m-stanton 的鑑定

~9mm in length, antennae; pale ventral side. Did not know the males visited the nest, perhaps a new bee (son) not ready to leave yet. Appeared to be guarding the nest entrance from possible intruders including ants. Nest appeared to be communal, a female seen in the same nest here: https://www.inaturalist.org/observations/123152265

Possibly assessing the chance of a light rain or monsoon from inside her nest/burrow or nest guarding. This appeared to be a communal burrow. A male bee, possibly a son, guarding the same nest can be viewed here: https://www.inaturalist.org/observations/123141023

Appreciating @m-stanton, "It has the unique extremely wide head in comparison to other Halictus species."

First photo crop/full; for the Daisy Fleabane (Erigeron strigosus), cf. inaturalist.org/observations/166712950