Two small insects interacting on a Hogweed leaf

Two small insects interacting on a Hogweed leaf

Observation - Two small insects interacting on a Hogweed leaf. Description: Mating, if that was what it was, involved only very brief intermittent contact* and I interpret the unusual structure at the rear of the female as an adaptation that acts as guide for the male. *The composite image shows two different episodes, as far as

Mating, if that was what it was, involved only very brief intermittent contact* and I interpret the unusual structure at the rear of the female as an adaptation that acts as guide for the male.
*The composite image shows two different episodes, as far as I was able to resolve them.