The syrphid genus Criorhina includes many large remarkable bumble bee mimics. At a distance, even a veteran insect watcher may be fooled. Viewing with butterfly binoculars or close up photos reveals the distinctive fly antennae and, possibly, only one pair of wings.
Photos 2, 3 and 4, especially, show the long face the genus was named for.
I have photographed four Criorhina species on the Olympic Peninsula:C. tricolor — 1, 2
All the images have been identified by Kevin Moran, via bugguide.