S AMMAN AND Gatenby — Acarine or Isle of Wight Bee Disease. 363 



This treatment should be tried during tlie winter months when the bees are 

 clustered. 



It should be pointed out that our experiments liave not been numerous 

 enough to enable us to claim that we have discovered a cure for Acarine disease. 

 But our experience leads us to consider that the method might with benefit be 

 tried by bee-keepers. 



DESCRIPTION OF PLATES XVIII AND XIX. 



All figures are from mierophotographs. Fig 1, X 400 ; figs. 2-8, X 120. 

 Fig. 



1. Adult male Acarapis woodi. 



2. Clear non-infected tube. 



3. Early stage of infection, one female (?) and two eggs, V-, P. 



4. Discolouration (d) of tlie tube caused by mites. 

 ^. Later stage of infection. 



6. Multiplication of parasites at its height (summer). 



7, 8. Winter tubes showing diseoloui'ation and very few mites. 



