Rare and declining across most of its range due to disturbance of tallgrass prairie habitat, mainly through conversion to cropland.
Top photo taken 8/12/15 in northern McKenzie County, ND at the head of native wooded draw in mixed-grass prairie, getting nectar in a colony of wavyleaf thistle (Cirsium undulatum).
Bottom photo taken on 9/8/13 in southwestern McKenzie County, ND, on wavyleaf thistle, at the edge of its range and the edge of its life. Imagine losing yourself to abrasion. This was a late-season discovery.
Serendipity, it seems. These two specimens were surprise findings, as they were photographed with 60-80x telephoto lenses and the photos weren't examined on a big screen until later that evening.