Once again proposing ID to species, despite many false Psithyrus hopes in the past -- male with yellow T1-T3, mostly black hair on face (which I think rules out B. perplexus?), small head, and very pronounced hairless swaths on T4-T6
Gibson, S. D., Liczner, A. R., & Colla, S. R. (2019). Conservation conundrum: at-risk bumble bees (Bombus spp.) show preference for Invasive Tufted Vetch (Vicia cracca) while foraging in protected areas. Journal of Insect Science, 19(2), 10.
https://doi.org/10.1093/jisesa/iez017
Found growing from a piece of cake that was forgotten in a fridge.
Somehow got 50k likes on Twitter / X with this image: https://twitter.com/Invertebratist/status/1718476500905930952