Leafcutter Bees are a medium sized, long-tongued native bee. They have a flattened or deflated looking abdomen, and often visit flowers with their abdomen curved upwards.
We start to see Leafcutter Bees in our landscape in early June. Some of the first native plants they visit are Harebell and Pale Purple Coneflowers.
A female nectars on Nodding Onion (Allium cernuum) showing off her pollen-laden belly.
Source: Attracting Native Pollinators: The Xerces Society Guide, Protecting North America's Bees and Butterflies