butterflies and the definition of stridulation?

[Anne Kilmer]

That would be friction, rather than percussion, don't you think? And
therefore stridulation. 
Think of the harpsichord as opposed to the violin ... but there
definitely exists a middle ground.
Anne Kilmer
South Florida

Boyd wrote:
> 
> In some mygalomorph spiders the term stridulation is used to mean sounds
> produced by "hairs" which engage, and are then pulled apart, this is much
> the same in many respects to what is seen in "Velcro" strips. I think all
> sound production in these spiders is due to similar effects, and all are
> referred to as stridulation.
> Boyd
> 
> --
> "The cure for boredom is curiosity. There is no cure for curiosity." -
> Ellen Parr
> Bugs,bats,hearing issues,fishing,peanut butter. Skeptic.
> In So. California