California Rotund-Resin Bee
Anthidiellum notatum robertsonii
Megachilidae
Anthidiellum
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Description
Anthidiellum notatum robertsonii are compact, yellow-and-black bees with an overlapping shelf at the back of the head, and an extended scutellum which projects over the propodeum. These overlaps, and the lack of paper-thin pronotal lobes on the thorax, help differentiate from Dianthidium. A yellow band runs along the back of the head, ending where the head curves down. Anthidium, Dianthidium and some Stelis bees can look similar.
Nectar/
Pollen Plants
This bee is a flower generalist.
Habits
Anthidiellum notatum robertsonii are known to build single-celled, pot-like, dark-brown, resin nests on pieces of wood on the ground, and have also been found to use existing beetle cavities in wood. Male bees are territorial and will bowl into perceived intruders. They are sometimes seen hovering near flowers.
Season
May - August
