Leucospis intermedia, (Llliger, 1807)
Family: Leucospidae.
Body length: varies from 4 to 12mm.
Season: May to September.
Widespread from Eastern Russia, to most of Europe; this species can be found also into East and North Africa. (Wherever their hosts are found)
Habitat: Grasslands, meadows and scrubland, being a parasitoid, mainly of the family Osmia (Mason Bees) and the family Megachile (Leaf cutter and mud bees).
As with most other Parasitoid wasps, the Leucospis intermedia female lays her eggs in the body of the hosts larvae; that will be eventually eaten by her newly-born wasps.
A distinguishable physical feature, is the hind femora being greatly enlarged, (As can be seen in some of the images below) with a row of teeth or serrations along the lower edge of the hind femora.