
Bombardier beetles are ground beetles (Carabidae) in the tribes Brachinini, Paussini, Ozaenini, or Metriini—more than 500 species altogether—which are most notable for the defense mechanism that gives them their name: when disturbed, they eject a hot noxious chemical spray from the tip of their abdomen, with a popping sound. The spray is produ...
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http://en.wikipedia.org/wiki/Bombardier_beetle

(from the article `coleopteran`) ...appearance or from their evil-smelling or distasteful secretions, either in the form of exudations of blood from definite parts of the body or as ... The snail hunters (e.g., Scaphinotus) are a specialized group of ground beetles. Elongated, hook-shaped mouthparts allow them to extract the snail ... ...
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http://www.britannica.com/eb/a-z/b/89

[
n] - beetle that ejects audibly a pungent vapor when disturbed
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http://www.webdictionary.co.uk/definition.php?query=bombardier%20beetle
noun beetle that ejects audibly a pungent vapor when disturbed
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https://www.encyclo.co.uk/local/20974

Beetle that emits an evil-smelling fluid from its abdomen, as a defence mechanism. This fluid rapidly evaporates into a gas, which appears like a minute jet of smoke when in contact with air, and blinds the predator about to attack. Classification Bombardier beetles in genus
Brachinus, family Carabidae, order Coleoptera, clas...
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https://www.encyclo.co.uk/local/21221

any ground beetle of the genus Brachinus, which ejects a puff of volatile fluid from its abdomen with a popping sound when disturbed.
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https://www.infoplease.com/dictionary/bombardier-beetle
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