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Flies, lice, gadflies and mosquitoes are the worst of the insect plagues.
Wingless insects, such as spring-tails and lice, make their appearance in the form of miniature adults.
Willughby, Ray and others in the late 17th century to include the active larvae of beetles, as well as bugs, lice, fleas and other insects with undeveloped wings.
All are transmitted by arthropods such as lice, mites and ticks.
How to recognize head lice The adult head louse is a small gray or brown insect, about the size of a match head.