You got me looking through old photos, Cindy and I discovered this one. You might like this wonderful bumblebee ID guide http://www.fs.fed.us/wildflowers/pollinators/documents/BumbleBeeGuideWestern2012.pdf
It's difficult to tell but it appears there is yellow in front of the wings and the single stripe on the abdomen. If so, then it's B. californicus. If you observed the a yellow stripe immediately behind the wing as well, then it's B. melanopygus.
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