On the bumble bees and parasitic bumble bees of north rhine westphalia west germany hymenoptera bombidae
Bonner Zoologische Beitraege 27(3-4): 267-299
Descriptive and distributional notes are given on 3 spp. of Bombus, 1 of Alpigenobombus, 6 of Pyrobombus, 12 of Megabombus including M. (Thoracobombus) humilis paraurantiacus ssp. nov., 1 of Confusibombus, 5 of Psithyrus, and 3 of Fernaldaepsithyrsus. The distribution of these species in 3 subdivisions of the region is shown. A bibliography includes about 70 titles.