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Amphotis marginata, or highwayman beetle, is a species of sap beetle in the family Nitidulidae. It's average length is 4–5 mm and it commonly lives with the ant Lasius fuliginosus. . This beetle is found in or around the ant’s nest which is usually made in old tree stumps or large, rotten fallen branches and trunks.

Description
Amphotis marginata beetles have a characteristic body shape that provides secure protection of its appendages in case of attack by ants. When frightened by its hosts the beetle protects itself by crouching flat and retracting its antennae and legs under the wide margins of its elytra and thorax.

Ecology
Lasius fuliginosus ants have been observed feeding the adult beetles through regurgitation. In many cases, these beetles and their larvae are fed and tended by the ants despite the beetle’s larvae preying on the ant’s brood.