White-fronted Small-Mason

The White-fronted Small-Mason (Hoplitis albifrons) is a bee in the family Megachilidae, found in the San Francisco Bay Area.

Its flight season is from May into September, with peak flight activity in June and July.

White-fronted small-mason bees are cavity nesters. Their brood chamber partitions are made of chewed-up leaf pulp sometimes held together with plant resins.