In the 1970s there was another meathod of identification of AHB invented.
Given AHBs' wings beat faster than EHBs' special michrophones have been developed that can determine this defference in pitch.
This again is because of AHB being smaller, as in small cell bees. If we are going small cell, or natural comb building, then the EHB is going to be the same as AHB in the beat of the wings.