Orchard Mason Bee

Orchard Mason Bee
Osmia lignaria
A megachilid bee that makes nests in reeds and natural holes, creating individual cells for their brood that are separated by mud dividers. They are unlike carpenter bees in that they cannot drill holes in wood. O. lignaria is a common species used for early spring fruit bloom in Japan, Canada, and the United States, though a number of species of other Osmia are cultured for use in pollination.

Orchard mason bees, like all mason bees, are very shy and will only sting if the bee believes it is in serious danger. It will not attack to defend itself. The stinger itself is actually an egg guide.
-Wikipedia
Photography (c) Maranda L. Scott