about 2 cm long
Copyright Chris Moody.
This was a very tiny fly. I thought it was a bit of dirt on the leaf but when looking at the photo, realized it had wings.
The leaf is about 7 mm across at the bug. I estimate the fly to be about 2 mm across the body and about 4 mm long.
I think it had just hatched. It is bent so that it's abdomen tip is just under the head.
It jumped once but did not fly.
Rhagio sp. Rock Creek Park, Washington, DC, USA. 31 May 2014.