178 MR. A. W. BENNETT OK THE CONSTANCY OE 



sylvestris, Humex acetosa, Saxifraga granidata. Confined its atten- 

 tion entirely to the dandelion ; but tbe number of visits was not 

 counted. 



28. Kew, May 14tli, 1881. Apis mellifica : The apple 5, with- 

 out visiting any other flower. 



29. . Bombus sp. : Pyrus Malios only, 14. 



30. " The Knoll," Ambleside, Aug. 5th, 1881. Melampyrum 

 pratense, Hypericum pulchrum, StacJiys JBetonica, PotenUlla Tor- 

 mentilla, Spircsa Ulmaria, Ruhus fruticosus. Bombus sp. : I£e- 

 lampyrum pratense only, 9 visits. 



31. . Bombus sp. : StacliysBetonica OTi{y,QV\%it^. This 



Bee was captured and the pollen on its hind legs examined under 

 the microscope. It w^as to all appearance of one kind only, 

 corresponding to that of Stachys JBetonica. 



32. 

 33. 



34. 

 35. 

 36. 



Stachys Betonica, 6. 

 StacJiys Betonica, 10. 

 StacJiys Betonica, 6. 

 StacJiys Betonica, 10. 



Syrpbus clypeata : Potentilla Tormentilla, 8. 



37. Low "Wood, Windermere, Aug. 11th, 1881. Centaurea 

 nigra, Serratula tinctoria, Spircea Ulmaria, Geranium sylvaticum, 

 Poterium officinale, AcJiillcea Ptarmica, Campanula rotundifolia, 

 Linaria vulgaris, PlupJirasia officinalis, StacJiys Betonica, S. pa- 

 lustris, LytJirum Salicaria. Bombus sp. : StacJiys palustris, 2 ; 

 Centaurea nigra, 2. 



38. . Bombus sp. : Centaurea nigra, 1 ; Serratula tin- 

 ctoria, 3 ; Centaurea nigra, 12. 



39. . : StacJiys Betonica, 3; Centaurea nigra, 1. 



40. . : Serratula tinctoria, 2. 



41. . : Centaurea nigra, 12 ', Serratula tinctoria, Z ; 



Centaurea nigra, 3. This Bee confined its attention to these two 

 species, althougb passing over a large number of other flowers. 



42. , Aug. 12tb, 1881. Pieris Eapse, S : Geranium syl- 

 vaticum, 2 ; Centaurea nigra, 2, at a great distance from one 

 another ; AcJiillcea Ptarmica, 1. 



43. . : StacJiys Betonica, 11, passing over all other 



flowers. 



44. . : StacJiys Betonica, 20, obviously rejecting 



botb the Centaurea and Serratula. These two last Bees were 

 both captured and the pollen attached to their legs examined, 

 when it was again found to be all of one kind, corresponding 



