Dear Bee-colleagues
 
     A friend and I look after three hives in his garden. One of the hives,
     and it's one that is REALLY flourishing, has a proportion of bees
     which seem to have very white backs (thorax, not abdomen). Otherwise
     they look normal and they appear to behave normally and the other bees
     do not seem to react badly to them. Is this a sign of disease, and
     therefore something we should be worried about, or is it just an
     interesting curiosity?
 
     Any thoughts/suggestions are welcome.
 
     Thanks
 
     Leo Walford
     London, UK