Identify Types of Bees: The Osmia Mason Bee

Bees of the Osmia genus are frequently called “Mason Bees,” and they’re most common in the western United States. They differ from other types of bees because of their unusual nesting habits.

Osmia females carry dry pollen in a patch of hairs (scopa) on the underside of the abdomen, a feature they share in common with other females in the family Megachilidae.
Photo By Rollin Coville