Bumble Bees

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Studies on Scandinavian <strong>Bumble</strong> <strong>Bees</strong> 47Taxonomical remarksKrtiger (1954, p. 267) distinguishes B. m. latocinctusfrom the nominate subspecies'diebykurze greisgelbe Grundbehaarung der Area centralis,des caudalen wie des oralen Teiles der Areatriangulares. Zwar ist auch bei dem typischenmagnus der orale Teil mit kurzen greisen Haarenversehen, aber nicht in so starkem Grade wie beiseiner Rasse latocinctus. Ausserdem ist bei dieserdas Scutellum in grosserem oder geringerem Gradgelb bzw. weisslichgelb behaart.' In the examinedScandinavian material those characteristics ofpile of face and scutellum are not much pronounced,sometimes lacking. The present knowledgeof this critical species is in my opinion toomeagre for subspecific designation of the Scandinavianpopulation being treated as B. m. latocinctusby Kriiger (1954, p. 271).QueenMorphological characters. Malar space markedlyshorter than distal width. Ocellar-orbital fieldas in Fig. 14; the variations in the sculpturing tendtowards that of B. Iucorurn Distance from lateralocellus to preoccipital ridge (d) about 514 longerthan distance from ocellus to eye (e), mean valued: e - 1.24; distance between ocelli hardly tomarkedly longer than half the diameter of themedian ocellus, usually about % this diameter.As about I /2 times the distal width and about /,rthe length of Aaa u. Tz with distinct dense and,coarse puncturing, usually with chagrinated microsculpture;the unhaired distal margin in themedian part often narrower than in -8. lucorum.Length and evenness of coat moderate, i. e. ingeneral as for B. lucorum. Body more robust thanin ,8. lucorum. Wings rather infuscate.Queen measurements: N -- 20: Hordaland(HOV): malar space: 0.65 mm (+0.04 +0.01)range: 0.55-0.70mm1' 'radial length': 4.69 mm(+0.10 +0.02) range: 4.50-4.90 mm; interalarwidth: 5.48 mm (+0.14 +0.03) range: 5.10-5.73 mm. Body of large size.Colour pattern Broad yellow collar extendingabout l/a down the adjacent episternum and oftenprojecting backwards below base of wing. Usuallya few yellow hairs concealed by black ones at theextreme posterior part of scutellum. Median partof T, with variable amount of yellow hairs. T,entirely yellow-haired except perhaps black hairsat posterior margin concealed by yellow ones.Pile of almost distal half of Tn, entire Tu, variablepart of To tawny or yellowish-white with brownishbase. Fringes of sternites brownish, occasionallylateral fringes of Stn-u coloured as hindmosttergites. Corbicular fringes brownish or tippedso. Otherwise coat black. The yellow tone innewly emerged specimens is less bright than inB. lucorum, but not as deep as in ,8. teruestris,i. e. it is neither lemon-yellow nor sulphurousyellow.Faded specimens of B. magnus and B. lucorummay display the same yellow shade or rheformer is more dull.Variation. Pile of face with a more pronounceddark brown appearance compared with the blackpile in B. lucorum, and occasionally a minor partof the matted short pilosity is yellowish-grey.Yellow pile on scutellum is ranging from singlyposterior hairs to covering almost entire crescentshapedpart of the segment. Individuals with entirelyblack-haired scutellum were examined.Yellow pile on T, ranges from single hairs in thecentre to alanost all hairs on the tergite, the shadeis ranging from pronounced yellow to paleyellowish-grey. A few individuals have slightlynarrower yellow-haired bands. Tb may have anadmixture of black hairs, preferably in the median jpart. Tu is occasionally entirely black-haired.WorkerOnly individuals with a colour pattern as typicalfor the females were sorted out in B. lucorumcollections. Additionally about 200 workers froma colony revised from ,8. lucorum (Loken l96la)were studied, all of which display a yellow collarextending a little less than % down episternumand slightly varying in width. Pile on scutellumand T, was moreover entirely black except in avery few specimens presenting a slight admixtureof yellow hairs. As stated by Kriiger (1954, p. 266)the hairs on the hindmost tergites in this casteare more whitish than those of the queens.
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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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