The wings of the bees are with a harmony of sound.  The leading edges of the
front wing has the curve on the underside that is like a violin string
vibration.  The underside is with Frisbee or parachutes to hold the lift air.
 At about 400 to 600 magnification you will see a tube much like a flute the
bottoms are broken at the area that the under wind hits.  The structural
brace on this front wing is near the leading edge of the wing thus leaving
the wing to flop in the wing like a flag.  The second wings structural brace
is back 1/3 of the surface of the wing leaving the front edge of this wing to
follow the depressions made by the flag flapping.  The extended 2/3 of the
wing flops in the sound that we hear some where between 240 and 265cps.  This
will vary when a bee is in you face and speaking to you that she is mad or
not happy with you there. The underside of the wing is a crystalline that
will crack like a window glass.  The fun can be enjoyed when you put tubes
like wind chimes at the entrance fly zone.  Add a little water after sealing
the bottom of the tubes to tune the pipes.  The bees will play with them by
flying over and getting sounds back.  Michael Housel  Orlando, FL