5), either in one or both sexes, and the occurrence of winged females with wingless males is noteworthy.
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.
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