- Dobsonfly - Megaloptera
Ferocious as they look, dobsonflies are harmless. They belong to the order Megaloptera, along with fishflies and alderflies. - Doglouse - Phthiraptera
While there is some disagreement on the exact methods for categorizing them, lice like this dog louse may be considered to belong to the order Phthiraptera (includes all lice) or separated into Mallophaga (just chewing lice) and Anoplura (just sucking lice). - Dragonfly - Odonata
Dragonflies and damselflies belong to the order Odonata. - Earwig - Dermaptera
Earwigs belong to the order Dermaptera. - Flea - Siphonaptera
Fleas currently are believed to be a strange version of scorpionflies, but traditionally are given their own order called Siphonaptera. - Fly - Diptera
Flies belong to the order Diptera. - Grasshopper - Orthoptera
Grasshoppers, crickets, and katydids belong to the order Orthoptera. - Hopper - Homoptera
Leafhoppers, froghoppers and spittlebugs belong with scales, cicadas and aphids in the order Homoptera. - Mantid - Mantodea
Mantids belong to the order Mantodea. - Mantidfly - Neuroptera
Mantidflies may resemble mantids or wasps, but belong with the lacewings in the order Neuroptera. - Mayflies - Ephemeroptera.
Mayflies belong to the order Ephemeroptera. - Twisted-wing parasites - Strepsiptera.
Twisted wing parasites like this one may be parasites of wasps or leafhoppers and belong to the order Strepsiptera. - Pillbug - Isopoda
Woodlice, or pillbugs are related to crustaceans in the Isopoda and are not insects. - Roach - Blattodea
Roaches belong to the order Blattodea. - Scorpionfly - Mecoptera.
Scorpionflies, snow fleas, and hangflies belong to the order Mecoptera.