The wingless types of insects are the most in number and each type in this category, which belongs to the insect classification chart, also has lots of species that are included. There are a lot of categories that exist in this broad category of wingless insects. One such pair of categories is the parasitic and the non parasitic type of insects. The parasitic insects are usually found in mammals where they live of the blood they suck from the bodies. The more common ones are lice. Another insect that feeds on blood from warm blooded animals is the flea. This is also categorized into wingless insects. There are also other insects like cockroaches, walking stick, mantis, cricket and grasshoppers.
There are modified winged insects like beetles which are its most common form. There are also various other insects like walking stick, cockroaches, grasshoppers, crickets etc that can be put into this category. Beetles are the only unique species of insect that are present in this category. All the categories of internet classification chart have the same types of insects. The above example of cockroaches, walking stick and cricket and grasshoppers proves this and this show there is no clear cut technique to identify an insect. The effort you have to put as an insect identifier is high and you will have to study this extensively. The insect pictures will give you a further idea of how to identify insects.