Brachinus sp.?

Oh, one of my favorite North American carabids!

This is not a true bombardier beetle, but the species Galerita bicolor, a bombardier-mimic (or false bombardier beetle). They have awesome predatory larvae with impressive long cerci (tails), longer than the body length!

 
They are predators of small arthropods - springtails, silverfish, bristletails, various larvae. Anything that is soft-bodied.

 
You often find bombardiers in the same place you find these. Looking under the rocks near streams during the day (or by the stream itself by night) can turn up thousands of them.

 
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