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The color patterns of typical Bombus melanopygus (left), Bombus sylvicola (right), and the intermediate form (middle) as found in the Kananaskis River valley in Alberta. In the illustration, black = black pile on the bee, ferruginous (red) = crosshatching, yellow = vertical hatching, and admixture of yellow and black (which gives a “dusky” appearance) = stippling. Clear = bare. High quality figures are available online.
