180 MR. A. W. BElSnSTETT ON THK CONSTAISTCT OF 



mined under tlie microscope. It was found to consist of an 

 enormous quantity of pollen-grains, of wliich by far the larger 

 part corresponded to that of the milfoil — small, bright yellow, 

 nearly spherical, and spined. This was mixed with a much 

 smaller quantity of two other kinds; one was not recognized; 

 the other, of which there were only a few grains, was apparently 

 that of JSpilohium montanmn, a plant not growing in the im- 

 mediate vicinity. 



58. " The Knoll," Ambleside. Syrphus clypeata passed in- 

 difierently from Acliillosa Millefolmm to Stachys Betonica. The 

 mass of pollen-grains in its abdomen, examined in the same way, 

 appeared to be of two kinds only, corresponding to the pollen of 

 these two plants. 



59. . Pieris Eapse, $ : Buhus fruticosiis, 1 ; Acliillcea 



Millefolmm, 2. 



60. -^ . Bombus sp. : Buhus frutieosus, 2 ; Stachys Beto- 

 nica, 1 ; Bubus frutieosus, 2 ; Teucriii/m Scorodonia, 7. 



61. , Aug. 21st, 1881. Potentilla Tormentilla, Melampy- 



rum jJ't'citense, Ilieracium sylvaticum, Solidago virgaurea, Calhona 

 vulgaris, O-aleopsis Tetrahit, Buhus frutieosus, Greranium Boherti- 

 amt/)n, Stachys Betoniea. A small Wood-Bee visited Potentilla 

 Tormentilla only ; the pollen on its legs was examined, and ap- 

 peared to belong to that flower exclusively. 



62. . Bombus sp. : Buhus frutieosus, Galeopsis Tetrahit 



(white), Corydalis clamculata, growiug completely intermixed. 

 Several Humble-Bees belonging to difl"erent species confined their 

 visits entirely to the bramble. 



63. CoisrisHEAD Peioet, neae TJlyerston, Aug. 22nd, 1881. 

 Seracleum Spliondylium, in great profusion, both white and pink, 

 intermixed with smaller quantities of Gentaurea oiigra, Trifolium 

 pratense, and Seneeio Jacohcea. Large numbers of Eristalis tenax 

 were hovering and settling on the Seraelewn Sphondyliiom, irre- 

 spective of colour, and on nothing else. The abdomen of two spe- 

 cimens captured was loaded with the pollen of this flower only. 



64. . Bombus sp. visiting Gentaurea nigra only, refusing 



Trifolium pratense. 



65. . . Visiting both Gentaxirea nigra and Trifolium 



pratense. 



66. . . Was watched visiting foxgloves, Digitalis 



purpiM'ea, of which there were about an equal number, white and 

 pink. It entered 16 flowers in succession, without visiting any 



