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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: Common
Select food plant genera: Cirsium, Phacelia, Penstemon,
Allium, Symphoricarpos, Monarda Tongue Length: Long Distribution: Sierra-Cascade Crest east to the Colorado Rocky
Mountains and south into the high mountains of New Mexico
and Arizona Can be confused with B. flavifrons Females (queens and workers, colors refer to ‘hair’) Thorax anterior to distinct black band between wing
bases yellow, scutellum and T1-2 yellow, T3-4 orange,
T5 black, face long. Mid leg basitarsus with the distal posterior corner
rounded. Cheek length longer than broad. Hair of the
face and top of head predominantly yellow. On the
side of the thorax, the lower anterior surface with long,
predominantly yellow hair, corbicular fringes black with
red admixture along posterior margin. Hair length long.
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