Holopyga generosa Förster, 1853
With thanks to Gian Luca Agnoli (www.chrysis.net) for the ID.
Tubize, BRABANT ● Belgium
Description: The length is 7–9 mm.
Both sexes are similarly bicoloured with a green or blue head and mesosoma, and a dorsally red metasoma. The colouration resembles that of Hedychrum gerstaeckeri and the male of H. nobile and H. niemelai, but H. generosa always has multidentate tarsal claws, angular margins on the head and an evenly rounded margin of T3. In Hedychrum, the claws are bifid, the head margins are rounded and T3 usually has angular prominences laterally.
Biology: The flight period starts from late May to late August. Adults visit flowers of Apiaceae, Asteraceae, Euphorbiaceae, Onagraceae and Rosaceae.
The host of the larva are Astata boops Schranck (Crabronidae). Females lay their eggs in nymphs of Heteroptera before they have been captured and brought to the nest by the host.
Habitat: Sparsely vegetated sandy areas, dry meadows.
Distribution: Trans-Palearctic species: Europe, Asia Minor, northern Africa, China.
Norwegian Biodiversity Information Centre