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Order Diptera: Two-winged insects

This is the only Order of insects that have but two wings (a fact expressed in the name). It comprises a great number of species. Not even the Coleoptera with it in numbers. And it embraces some of the most annoying insects - as the Mosquito, Horse-fly, Gnat, and House-fly, also many that are decidedly injurious to vegetation - as the hessian-fly, Wheat-midge, Onion-maggot, etc., etc. But many of the larvae act the part of scavengers, and some few are beneficial to the agriculturist - as the Syrphusand Tachina flies. The young of this Order are known as Maggots.