Dianthidium
Dianthidium
Megachilidae
Dianthidium
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Description
Dianthidium are yellow and black bees, and not hairy (except toward the back of the thorax). They have 2 submarginal cells, and have pronotal lobes on the thorax that are paper-thin (see black arrows above). Yellow on the face runs along the inside of the compound eyes. All Dianthidium in California belong to the subgenus Dianthidium. Anthidium, Anthidiellum and some Stelis bees can be similarly colored.
Nectar/
Pollen Plants
On Mount Diablo, Dianthidium are found on Great Valley Gumweed (Grindelia camporum) and Heermann's Tarweed (Holocarpha heermanii), as well as on other flowers
Habits
Dianthidium are called pebble bees because they construct nests from sand or pebbles (bound with mud or resin) and place them on twigs or on roots within animal burrows
Season
Late May - August
