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Passalidae

family

“Bess Beetles”

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On Wikipedia

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. Bodies elongate-cylindrical and black overall; ventral surfaces may be covered with yellow setae. The head is narrower than the thorax, with antennae consisting of 10 antennomeres with a three-segment club. The elytra are elongate with parallel sides, and heavily striated. They are subsocial (brood caring) beetles that live in groups within rotting logs or stumps. The beetles will excavate tunnel systems within rotting wood where the females…

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Range Maps show field notes recorded by Natural Atlas contributors and other datasets via GBIF.org

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Passalidae

Passalidae

Passalidae