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Female. Found under a pile of loose sand that was probably the start of a nest burrow. I poked at the sand, expecting to find a burrow that had been blocked, and found her instead. After taking photos, I returned her to where I found her.

Ground-dwelling, observed digging in soft ground. At least 4 bees observed in area at the time. Pictured are two separate specimens. Exact species unknown by me, but believed to bee Andrena Clarkella?
@mollymjacobson

After looking through Triepeolus species on BugGuide, I'm wondering if this might be Triepeolus eliseae. I have additional photos if they'd be helpful, but unfortunately only the one (included here in this entry) that shows the bee from the rear - and it's somewhat blurry as the bee was spinning on the flower when I snapped that picture, and it flew away a few seconds later. Bee found on rudbeckia, back yard.

Surprising for me. All over on Dasiphora fructicosa; rather late date. Flowering phenology of Dasiphora varies from place to place, can be as early as June (often August-September in fens around here). Wide vertex and apical areas of tergites, fairly dense punctures on scutum (vs. virginiana). Det confirmed with voucher specimens. Seems these guys and virginiana are probably most plausible Trachandrena in August-September in the northeast...