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Extracted from Jonathan Koch, James Strange,Paul Williams.2012. Bumble Bees of the Western United States. A product of the U.S. Forest Service and the Pollinator Partnership
with funding from the National Fish and Wildlife Foundation Status: Uncommon
Select food plant genera: Phacelia, Collinsia, Clarkia,
Streptanthus, Penstemon, Stachys Tongue Length: Medium Distribution: Pacific States from Washington to
southern California Can be confused with B. vosnesenskii, B. caliginosus,
and B. californicus Females (queens and workers, colors refer to ‘hair’)
• Thorax anterior to distinct black band between wing
bases yellow, scutellum and T1-2 usually black, T3
yellow at least apically, T4-6 black. Mid leg basitarsus with the distal posterior corner
rounded. Cheek length longer than broad. Hair of the
face and top of head completely yellow. On the side
of the thorax, the lower anterior surface with black
hair, corbicular fringes black. S2-5* with yellow hair
apically. Hair length medium and uneven.
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