Weird Insect Behaviour

[CallieH]

Hi, was wondering if anyone knows what's going on

I got up this morning to find several insects on the outside of my window. They look a bit like small striped wasps but are black and white and have a face more like a fly. The weird part is that they are all hanging upside down and not moving and each one has created a white mark on the window. There doesn't seem to be anything out there that they are hanging off either. Any ideas?

[Milvus]

Re they Scaeva pyrastri (pied hover flies)

[Chipchopper]

From your'e description it sounds like the 'Pelluced Fly' Vollucella pellucens.

[heathfield]

Scroll down to '2 - Wasp-like Hoverflies' here...

http://www.gardensafari.net/english/hoverflies.htm