Bumble Bees

Studies on Scandinavian Bumble Bees 193Fig. 94. The average northern limits of A: B. muscorum (Linnaeus); Bt B. tenestris (Linnaeus); C: B. subterrazeas(Linnaeus);D: B. magnus Vogt; E: B. sylvarum (Linnaeus); F: B. humilis Illiger; G: B. Iapidarius (Linnaeus);H: B. ruderarius (Miiller); I: B. distinguendus Morawitz; J: B. soroeensis (Fabricius).Uppland. This atlantic type of distribution isemphasized by the subspecific splitting of theScandinavian species (Fig. 82) of which B. m.Iiepetterseni is adapted to the atlantic climate onthe Norwegian west coast. However, owing toa few relic occurrences north of the indicatedboundary (Fig. 94 A), that of Finland:Kilpisjiirvifar northLe:situated in the mountain region asas 69" N, B. muscorum apparentlyproceeded further towards the north during morefavourable climatic conditions in earlier postglacialperiod than at present. Outside Fennoscandiathe species occurs in the British Islesand ranges throughout the European continentnortheast to almost the Polar Circle in Russiaand with relic occurrences north to 69" N.Further east it occurs in Kazakhstan, NorthernTien Shan, Southern Siberia, Northern Mongolia