Mark Sturtevant wrote:
Nice shots! I do agree with tinusbum. This is the rear end of it, with a pair of posterior spiracles. This one would be a hunter of aphids. If it was sitting very still, then maybe its looking to pupate or its in the terminal stages of being parasitized.
Thanks Tom and Mark, I can see that now. Most Syrphid larvae I have seen were almost transparent which threw me off the scent - my excuse anyway