19" x `15"
Insect wings are examples of bilateral symmetry.
Cicada wings are delicate and just strong enough to perform the tasks needed to provide short range flight. Strong leading edges of the wing balanced against the tracery of veins and ever-so-thin membrane are ideally suited to perform perfectly for the six to eight weeks of the cicada's lifespan.
The beauty of the cicada wings is in the millions of years of evolutionary changes completely unconcerned with the beauty of the efficient of the bilateral symmetry.