Bumble Bees

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Studies on Scandinavian <strong>Bumble</strong> <strong>Bees</strong> 39B. terrestns males are in general distinguishedfrom B. lucorum s.l. by several features, cf. thedescription below. In some specimens the diag-xtrstrP o\'k*",ft. xooaartclaa\ooIoof,oFig. 53. Triangular graphing of 'radial length' (B), distance from lateral ocellus to preoccipital ridge (D) anddistance from lateral ocellus to cornpound eye (E) of four speciesof Bombzs (s. s.).ments, together with those of 'radial length', givea better spreading of the rnarkings (Fig. 53).Though again there is overlapping between B.terrestris and R. magnus, the atea occupied byeach of the four taxa is well-defined. The separatedistribution of B. lucorum and B. magnus oneither graph (Figs. 52-53) is of vital irnportanceto indicate their specific difference, and thus confirmsthe statement of Krtiger (1954).As mentioned above, the queens of all fourspecies were recogn ized, whereas this was not thecase in the males. I am in fact at present not ableto distinguish B. magnus males. According toKrtiger (1954) they are separated from B. lucorummales by longer hairs and certain details in theextension of yellow hairs, but owing to variabilityin those characters more informatiorr is needed.The Scandinavian B. lucorum males have so farbeen broadly separated into a 'dark' and a 'blond'form. Recent chemic al analysis of odiferous compounds(Kullenberg et al . 1970) reveals howeverthat each of the two forms, presented as B. lucorum'dark' and R. lucorurn'blond', process different,characteristic secretion emanating fromglands in the heads. fnir difference may favoura theory of trvo species being involved, i.e. the'dark' form rnay refer to B. rnagnus.
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on Scandinavian Bumble Bees181Fig.
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A free drawing by G. Langhelle, fro
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Bumble Bees

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