Tripartite Sweat Bee

The Tripartite Sweat Bee (Halictus tripartitus) is a bee in the family Halictidae, found in the San Francisco Bay Area.

This species is a common and widespread member of the Halictus genus, found at garden sites throughout California. Halictus farinosus and Halicstus ligatus are also common.

Its flight season is from March into October, although males do not appear until June. Peak activity is from June into September.

Tripartite sweat bees are primitively social bees that form annual colonies in the soil, often in flat, bare ground. Nests are often aggregated.