Chrysis inaequalis Dahlbom, 1845
With thanks to Gian Luca Agnoli (www.chrysis.net) for the ID.
Tubize, BRABANT ● Belgium
Description: The head and the thorax are shiny metallic blue-green, while the abdomen is red. Adults grow up to 5–10 millimetres long.
Biology: Adults can be encountered from late June to mid September, especially flying on sun-exposed walls, on rocks and on dead wood. This species is a parasite of bees and wasps. Main hosts are Osmia, Eumenes and Odynerus species. The adults feed on sweet foods such as nectar, honeydew or various exudates.
Distribution: From Central and Southern Europe to Middle East, central Asia and North Africa.
Agnoli G.L. & Rosa P., 2019 : Chrysis inaequalis Dahlbom, 1845 . In: Chrysis.net. Database of the Italian Chrysididae.
Wikipedia, Chrysis inaequalis