Communal females burrowed in sunny soil with very little vegetation cover. Red, much smaller males swarmed over the female burrows the day after the females made their burrows to mate.
Also submitted to Bumble Bee Watch
Foraging in large patch of bull thistles; elev. approx. 1191m
In large patch of thistles; open prairie; elev. approx. 1190m
In patch of hairy vetch; elev. approx. 1352m
This one is for the bee.
Flower is here: https://www.inaturalist.org/observations/30200681#activity_identification_65531359
Sparse conifer forest; elev. approx. 1689m
Narrow open area between forested slopes.
Sparse conifer forest; elev. approx. 1699m
When I first saw this I assumed B. nevadensis, but it just looks a little different from what I’m used to seeing in that species. The next closest I’m getting is B. morrisoni - out of documented range though in predicted climatic suitability (Williams et al. 2014).
Color is a richer yellow, top of head yellow, u-shaped yellow with black below on t3. Tried zooming in on face but can’t quite tell cheek length to width ratio or clypeus pitting to distinguish from nevadensis. Maybe a more discerning eye can.
I’ve seen an Eastern Carpenter Bee show up around this time of year for the past 3 years.