Alvord Desert, Bureau of Land Management, Oregon, USA
No setae under petiole, basal tooth offset
~6940' elevation.
Nectaring on Thistle.
HUGE queen.
Might be a helpful view for some
Vagans on the right
Sandersoni on the left
Don’t mind how beat up the specimens are
Suspect P. occidentalis. From same nest entrance as individual here (nest also included):
https://www.inaturalist.org/observations/197527963
Watch a video of this fascinating bee! https://youtu.be/V16MUAU28aU?feature=shared