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Most probably a female of Picconia incurva (Zetterstedt, 1844), a parasitoid of Chrysomelidae. Galeruca tanaceti is already known as host of this species (see d'Aguilar, Bull. Soc. ent. Fr. 1959: 17, and Farinets and Matkovskyi 1984 in "Dipt. Fauna USSR and their significance in ecosystems").

Herting (Monografien angew. Ent. 16, 1960: 52) supposes that eggs are laid on the host larva, but it is known that puparia of the fly have been found in dead beetles (Aguilar 1959).

Meigenia females have a narrower frons than the specimen on the photo.

Peter