After work by researchers who analyzed songs of tree crickets in multiple states, it is now generally accepted that greenish tree crickets with dark on the antennae, head, pronotum and/or limbs - that are west of Ohio - are Forbes' tree crickets.

(This much black rules out Prairie tree cricket)

It's more likely O. forbesi given the location in Wisconsin, but the only way to tell these two species apart is by the song pulse rate of a singing male.

Moved from Tree Crickets.