What insect are you talking about? Here is some information that I got from Googling "auditory hairs of insects."
http://books.google.com/books?id=v_cQAQAAMAAJ&pg=PA30&lpg=PA30&dq=auditory+hairs+of+insects&source=bl&ots=NipUx_hA5H&sig=guTenhQa2kPJT2ijX84IM9lHLaU&sa=X&ei=rSo0UMfdHuWg2QWJu4DQBw&ved=0CDAQ6AEwBQ#v=onepage&q=auditory%20hairs%20of%20insects&f=false
What is the tiny hairs of hearing and sensing of an insect body?
3 answers
What is the answer for tiny hairs for hearing and sensing
Tiny hairs for hearing and sensing