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Passalidae



Passalidae is a family of beetles known variously as "bessbugs", "bess beetles", "betsy beetles" or "horned passalus beetles". Nearly all of the 500-odd species are tropical; species found in North America are notable for their size, ranging from 20-43 mm, for having a single "horn" on the head, and for a form of social behavior unusual among beetles.



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