> I believe any study for aggressiveness of the European Dark Bee which does not include determination of the purity of the species A.M.M can not be taken seriously

A. m. m. is not a distinct species. There are those who suggest that the so-called subspecies distinction is too vague to be meaningful. An example, not strictly about bees but a related order:

> The subspecies concept was originally conceived as a formal means of documenting geographical variation within species based on morphological characters; however, the utility of subspecies is hampered by inconsistencies by which they are defined conceptually, a lack of objective criteria or properties that serve to delimit their boundaries, and their frequent failure to reflect distinct evolutionary units according to population genetic structure.  -- Braby, Michael F., Rodney Eastwood, and Neil Murray. "The subspecies concept in butterflies: has its application in taxonomy and conservation biology outlived its usefulness?." Biological Journal of the Linnean Society 106.4 (2012): 699-716.

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