English
Reference
Bo W. Svensson (1979): Pyrobombus lapponicus auct., in Europe recognized as two species: P. lapponicus (FABRICIUS, 1793) and P. monticola (SMITH 1849) (Hymenoptera, Apoidea, Bombinae) – Monografien Entomologie Hymenoptera – 0081: 275 - 296.
