A true sting apparatus, until recently known only in Scorpions and Aculeata, has been discovered in a third group.
The first known case of a cerambycid beetle using its antennae "to inject a secretion that causes cutaneous and subcutaneous inflammation in humans", reported in the article "Convergent evolution in the antennae of a cerambycid beetle, Onychocerus albitarsis , and the sting of a scorpion", by Amy Berkov, Nelson Rodriguez, and Pedro Centeno, has just been published online Nov. 15, 2007, by SpringerLink. The above link is to the abstract of the article. In case you cannot access the full article, you may contact me per e-mail.
By the way, the authors thank, among others, the recently deceased Frank Hovore (known to many at bugguide) "for his unflagging skepticism".