Hexapoda mostly with wings, the wingless forms clearly degraded.
Fleas are wingless insects, with a laterally compressed body, small and indistinctly separated head, and short thick antennae situated in cavities somewhat behind and above the simple eyes, which are always minute and sometimes absent.
Starting with the kiwi and cassowary, people have got into the habit of confounding flightless with wingless conditions.
In the wingless female glow-worm (Lampyris, fig.
Such " workers " are essential to the formation of a social community of Hymenoptera, and their wingless condition among the ants shows that their specialization has been carried further in this family than among the wasps and bees.