Katydid nymph

I suggest that you take Katydid nymph as common name and Pseudophyllinae as scientific name.
http://www.projectnoah.org/spottings/821...

Thanks Bayucca. I am not sure how to reply directly to comments, I'll figure it out one of these days. I suspect you are right. I didn't argue with him because while he knows a lot I've caught him out once or twice, he's a terrible snob about this sort of thing so I don't bother saying anything.

I am pretty sure this is a Katydid nymph not a spider. Might be the same genus (Idiarthron sp.) like this one:
http://www.projectnoah.org/spottings/821...
You clearly can see the backward folded very long left antennae (not legs), the right antennae is looking forward. Mine was IDed by Piotr Nascrecki, a wellknown katydid expert.

I was told by a local biologist that this was some kind of spider, with two legs doubled up...

Tettigoniidae, Katydid.