I've noticed that bug spirits are mentioned a lot throughout several of the supplement books as well as both SR4 and SR4A, but I've yet to see a game centered around hunting them.
Has the scenario been overdone?
I'm fairly new to Shadowrun and so unfamiliar with the history (ie, earlier versions, core game missions, etc.)
I have played around with creating a bug-hunter character, but there doesn't seem to be any demand for the archetype.