Pollinators in my back yard

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I was watching pollinators in my garden on Saturday AM. Bees were particularly active around the Ceanothus which was brilliant blue in the sun, but there was also a small wasp-looking thing (not shown below, but it was 1/4 to 1/3 the size of a European honey bee, long but narrow, with a banded abdomen. Reminded me of a termite.) and another that looked exactly like a housefly. In fact, the housefly look was so real, as was its movement, that I doubt that it was adaptive mimicry. Why would anyone mimic a fly anyway? So I guess I now have to count flies among the pollinators in my garden.

This isn't news to some, but there are far more pollinators on the native plants than any other plant around.