. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 5° ANGIOSPERMAE—DICOTYLEDONES (Bombus hortorum Z.) sucking, and occasionally the ground humble-bee (Bombus terrester Z.). Hermann Miiller—in the Alps—saw various humble-bees sucking nectar or collecting pollen, and one of them (Bombus mastrucatus Gerst.) biting through the upper sepal and stealing nectar, though some individuals sucked it in the legitimate way. In the same region he also noticed one of the Lepidoptera (Lycaena sp.) vainly trying to get at th
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 5° ANGIOSPERMAE—DICOTYLEDONES (Bombus hortorum Z.) sucking, and occasionally the ground humble-bee (Bombus terrester Z.). Hermann Miiller—in the Alps—saw various humble-bees sucking nectar or collecting pollen, and one of them (Bombus mastrucatus Gerst.) biting through the upper sepal and stealing nectar, though some individuals sucked it in the legitimate way. In the same region he also noticed one of the Lepidoptera (Lycaena sp.) vainly trying to get at the nectar. Frey-Gessner observed the following bees in Switzerland.— I. Bombus agrorum F. 5, 5, and S; 2. B. alticola Kriechh. 5 and S; 3. B. brevi- gena Tin. ( = B. mastrucatus Gerst) ; 4. B. Gerstackeri Mor. 5, 5, and S (especially foundress-queens); 5. B. hortorum Z. 5 (which had deserted the nest), §; ^.nd S; 6. B. niendax Gerst. one 5, many 5^ one S ; 7. B. pratorum Z. Dalla-Torre noticed B. alticola Kriechb. in the Tyrol, and Schletterer B. hortorum Z. in the same Fig. k>. Aconitttm Napellur;. L.{^h<iX W^\i\\ftT). A. Flower in first (male) stajrc. The dark- coloured stamens have become erect ; their anthers have dehisced, and are coated with white pollen. B. The same flower seen from the side; a. a hole bitten by Bombus mastrucatus. C. The same in longitudinal section. D. Stamens and carpels in the first (male) stag^e ; some of the anthers are mature, the stif^inas are still immature; a\ undehisced anthers with filaments bent back; a-, stamens that are becorninf^ erect; a\ stamens that are erect and covered with pollen ; a*, stamens with empty anthers bending backwards; a'\ ditto, completely bent back. E. Stamens and carpels in the second (female) sta^e : the anthers are all empty, and the stamens bent back : the stigmas are mature. (A—C natural size ; U and E X 2.) Gerstacker observed the following humble-bees at Kreuth.— I. Bombus hortoru
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