Supplementary Observations on the Nests of Bombus (Bombus) hypocrita hypocrita Perez (Hymenoptera, Apidae), with Special Reference to the Nest Architecture and Colony Size

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  • オオマルハナバチBombus(Bombus)hypocrita hypocrita Perezの巣の追加記録,特に巣の構造とコロニーサイズについて
  • オオマルハナバチ Bombus Bombus hypocrita hypocrita Perez ノ ス ノ ツイカ キロク トクニ ス ノ コウゾウ ト コロニーサイズ ニ ツイテ

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New bionomic information of the Japanese bumblebee, Bombus hypocrita hypocrita Perez, is given, basing on the examination of 8 nests collected in Tochigi and Nagano Pref., central Japan between 1979 and 2003: 1) Underground nest sites were prevalent, but surface or aboveground nests were also observed. 2) Wax envelope was frequently present in mature nests. 3) Connection of cocoons was loose and peripheral cocoons tended to detach from the cluster of cocoons. This brought about the irregular arrangement of batches. 4) Colony size was not so large as compared with that of B. ignitus and B. diversus, the number of cocoons/colony rarely exceeded 500. 5) Output of new queens was also relatively small and the average number of queen cocoons/mature colony was 64. 6. 6) Only one adult female of the pupal parasitoid, Mutilla europaea mikado Cameron, was found in one of 8 nests. All features are shared with those of the lowland consubgener, B. ignitus, except that colony size and output of new queens are smaller in B. h. hypocrita than in B. ignitus.

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