Rhynchium oculatum is a large potter wasp up to 3 centimeters in size. It is coppery red and may have yellow markings on its abdomen. The ends of the wings appear darkened.
In the adult state, it drinks nectar from flowers, contributing to the pollination of various species. It lives solitary and builds nests, preferably in abandoned galleries of wood-eating beetles in old logs; In them he arranges various cells delimited by mud walls and fills them with several paralyzed caterpillars as a larder for when the eggs hatch. Once the gallery is filled, seal the exit with more mud and repeat the process in another tunnel.
It lives near watercourses, grasslands, wetlands, orchards, gardens and urban parks. It has a wide distribution throughout southern Europe.
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