>If they are AHB then the cell size and resistance to Varroa
> mites is explained...

Before this grows into another urban myth, Africanized Honey Bees have not
been proven to be resistent to varroa mites.  They may be less inclined to
succumb to the parasite, but the speculation is that it's due to the AHB's
inclination to swarm and even abscond, thereby breaking the brood rearing
cycle.

Aaron Morris - thinking urban myths rule!