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 Forest bumble bee Status: Uncommon Select food plant genera: Senecio, Chamerion, Lupinus,
Melilotus, Arenaria, Raillardella Tongue Length: Medium Distribution: High mountains in the western U.S. including
the Sierra Nevada, some “Sky Islands” in the Great Basin
and the Rocky Mountains Can be confused with B. melanopygus, B. bifarius, B. huntii,
and B. rufocinctus Thorax anterior to distinct black band between
wing bases yellow, scutellum and T1 yellow,
T2-3 orange or black, if black sometimes
yellow medially, T4 usually yellow, T5 yellow
at least apicolaterally, face square. Mid leg basitarsus with the distal posterior
corner rounded. Cheek length as long as
broad. Hair on the center of face yellow with
black admixture above the antennal bases.
On the side of the thorax, the lower anterior
surface with yellow hairs, corbicular fringes
black. Hair length long and very uneven
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Extracted from: Laverty T.M., & Harder L.D., (1988). The Bumble Bees of Eastern Canada. Can. Ent. 120: 965-987.
Description. All castes small to medium. Head slightly elongate; malar space slightly longer than wide. Tongue length medium. Colour pattern as in Figure 14. Some females have a black vertex or yellow T2. Interalar band extended or not as notch onto scutellum; if not notched, then T5 and T6 black medially with yellow hairs on lateral margins. Tergum 5 and T6 of some specimens completely covered with yellow pile.
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