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Psenulus pallipes

https://en.wikipedia.org/wiki/Psenulus Psenulus pallipes is a Palearctic species of solitary wasp. Body black, slender. Abdomen with a clearly narrowed shaft. Transparent wings – in the forewing 3 submarginal cells Cu, of which the middle cell Cu2 clearly narrows towards the outer, anterior edge of the wing, taking on an almost triangular shape in outline – an important diagnostic feature of the genus. Individual species of the genus are usually very difficult to distinguish in field photographs. Similar to Psenulus fuscipennis and some other species.

Adults feed on nectar, honeydew; sometimes they cut aphids with their mandibles to taste the honeydew. However, they take most of the caught and paralyzed aphids back to the nest as food for the larvae - for one larva the female gathers up to 30 aphids.