Williams, Paul H., Robbin W. Thorp, Leif L. Richardson, and Sheila R. Colla. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014. http://www.jstor.org/stable/j.ctt6wpzr9.
- has the best modern color guides for identification of both sexes, microscopic identification characters, range and natural history notes.
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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
Vosnesensky bumble bee
Status: Very common, possibly increasing in abundance
Distribution: Exclusive to costal California, Oregon and Washington east towards the Sierra-Cascade Crest; uncommon, but present in Nevada
Can be confused with B. caliginosus, B. occidentalis, and B. vandykei
Thorax anterior to black band between wing bases yellow, scutellum black, T1-3 black, T4 yellow, T5 and T6 black, face square and yellow.
Mid leg basitarsus with the distal posterior corner rounded. Cheek length as long as broad. Hair of the face and top of head yellow. On the side of the thorax, the lower anterior surface with long, predominantly black hair, corbicular fringes black. Hair length medium and even.