Osmia ribifloris is a species of solitary bee commonly known as the blueberry mason bee. It is native to North America and is known for its role as a pollinator of blueberry plants. The females of this species construct nests in pre-existing cavities, such as hollow plant stems or beetle burrows, where they lay their eggs and provision them with pollen and nectar. Osmia ribifloris is an important pollinator for blueberry crops and contributes to the overall biodiversity of its ecosystem.