Ants, bees and wasps belong to the order Hymenoptera, the third largest order of Insects. There are about 150,000 species that have been identified worldwide. Of these, about 22,000 are found in North America.
Flies belong to the order Diptera, which contains true flies, gnats, mosquitoes, and others. Diptera is a large order containing about 120,000 species that have been identified worldwide. Of them, about 17,000 species have been observed in North America.