---

Erik Nielsen (new member here) posted a few photos on the danish forum Fugle og Natur of a Sphaerophoria scripta larva* and then of the imago. This was from middle of December. That larva came with some Pelargonium x hortorum and developed to an adult indoors. Maybe the Episyrphus balteatus larva found a fitting plant in a warm cosy environment, perhaps indoors, and then flew outdoors and landed on that guy!? :D

* I think he submitted it to the gallery here