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This one keys out to Muscina in the Manual of the Nearctic Diptera muscid key and then to Muscina stabulans using Huckett's California key (Bulletin of the California Insect Survey 18: 1-148, 1975). That key doesn't include Muscina levida but that species is supposed to have all dark legs.

I don't have a photo demonstrating the absence of setae on the posterior side of the metacoxa but did confirm that under a microscope. The fly darkened considerably between the time the live photos and "postmortem" photos were taken.

I'd appreciate it if someone with more expertise in muscids would confirm or correct that ID. Thanks in advance!

Regards
Steve