What could this bug be sagging out around our tomato plants? It looks like a four legged gray spider. It's rear close arches...

It looks like a four legged gray spider. It's rear close arches upward into a hook shape. It comes out in the evenings when the spiders, mesquitos and other nightime bugs start showing up.

I'm intersted to know if it is a tomato's friend or foe.

Web site references would be appriciated as resourcefully.
Answers:    Could be a type of assasin bug called the wheel bug.
They are beneficial insects that nurture on aphids and caterpillars.

Do a goodle image search for gearstick bug to see if you agree.
It's probably a scorpion. pick it up and if it stings you and you die it was. It probably is there toeat the other bugs.