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Extracted from: Cockerell T.D.A. (1919). The Bees of the Rocky Mountain National Park (Hymenop.). Entomological News Vol. 30.
Evidently this species, but possibly a local (mountain) race, as it differs from the type by the blacker abdominal bands, larger yellow mark on sides of second segment, and pair of subdorsal yellow spots on fourth and fifth segments.
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