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Fan-bristled robberfly

Dysmachus trigonus


A medium-sized (body length to 17 mm), robustly-built, black-legged robberfly with the thorax more strongly humped than Machimus, Philonicus or Tolmerus species. It also has particularly long hairs and bristles on top of the thorax and a conspicuous white beard and bristles along the hind margins of the tergites.


Dysmachus trigonus is widespread and often common in sandy habitats such as heathland and coastal dunes. Adults fly from May until September. Recorded prey includes flies, beetles, moths, bugs, damselflies and cockroaches. Females have even been recorded eating the smaller males. The larvae are presumed to develop as predators in sandy soil.


Not entirely sure if this is the right ID for this robberfly, nor do I have a clear ID (possibly caddisfly) for its prey. Spotted in De Sprengen, Veluwe, Holland. (sources: see reference)

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Spotted by

Heerde, Gelderland, Netherlands

Spotted on Aug 14, 2019
Submitted on Jan 19, 2020

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