Body length 14 to 16mm. Black with a white face and red legs. The female has a very long ovipositor, about 15mm long.
Areas where the Alder Wood-wasp, Xiphydria camelus, can be found. The female drills through the wood to lay her egg in the wood-wasp larva.
Status and distribution
Fairly widespread but thinly recorded throughout southern Britain as far north as Yorkshire.
Best time to see