Fleas are oviparous, and undergo a very complete metamorphosis.
There are many large and poisonous spiders and flies; fleas and mosquitoes abound.
(I) Plague can be carried by fleas from an unhealthy rat.
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.
We may remark that fleas possess no wings, but are understood to possess a true pupa.