Most likely Neomochtherus willistoni unless there are other genus in the PNW.
This fly was near the top of a tall grass stem in open meadow/field habitat. It was persistently interested in an ant carcass that was immediately adjacent to a seemingly unattended spider egg sac -- see 2nd & 3rd photos in the series. It looked as though it might possibly be eating and/or drinking fluids from the ant's body.
Bee was observed feeding on Calamintha ashei plant in full bloom. This was the beginning of the bloom for this calamint population, and an early observation of the bee compared to known samples. This is the first Blue Calamintha Bee ever photographed outside of known paratype locations. The previous records for the bee came from 16 square miles in Lake Placid, Florida. This specimen was released unharmed, only temporarily restrained for species identification photos.