greenbottle butt?

greenbottle butt?

Observation - greenbottle butt? - UK and Ireland. Description: I've been reading about the different shaped butts of greenbottles versus another species of fly (of which I cannot remember) and am wondering what you think. (This isn't the same fly as the other one I have posted)

I've been reading about the different shaped butts of greenbottles versus another species of fly (of which I cannot remember) and am wondering what you think. (This isn't the same fly as the other one I have posted)