The Assassin Bug

This is the only insect species in the united states with such a crest. The number of teeth or tubercles in the crest varies from eight to 12. Scientists, as far as i could tell, don't know what this is for yet. They do appear to practise some amount of sexual cannibalism. I think they create a chirping sound by a certain type of a friction mechanism where they rub one part of their body on another.