Bombus affinis (the rusty patched bumble bee), B. terricola (the yellow-banded bumble bee), and B. occidentalis (the western bumble bee).
Prepared by Elaine Evans (The Xerces Society), Dr. Robbin Thorp (UC-Davis), Sarina Jepsen (The Xerces Society), and Scott Hoffman Black (The Xerces Society).
Assessing the status of Bombus affinis (the rusty patched bumble bee), B. terricola (the yellow-banded bumble bee), and B. occidentalis (the western bumble bee).
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