While I was writing the post about treehoppers, I went in search of a simple diagram of insect anatomy. One of the pictures that Google threw my way was the one here. From my limited experience, Earth Life Web isn’t bad in general, but they got the wings of their generalised insect totally wrong. Insects (without exception AFAIK) have three thoracic segments, and the wings of flying insects are on the second and third. NOT the first and second, which is what the Earth Life diagram looks like.
Just goes to show that you have to be very, very careful when mining scientific information from the web. Or from anywhere else, really.