To what segment of the thorax are the forewings attached on a grasshopper?

Grasshoppers are typical insects. If you look at its body you will see that like any typical insect, it is split into three main parts:

In front the head;

In the middle a part we call the thorax, which means the chest;

At the back is the abdomen, which means something like the "belly".

The thorax is the part where the legs and the wings grow, neither the head nor the abdomen.

People who think "The jumping legs of a grasshopper are attached its butt." need to do their homework before talking about such things.