Gnats are generally mistaken for fruit flies. But gnats are actually different in size and color. Gnats look like mosquitoes, with a long abdomen and long legs. They have transparent wings and are really tiny. The female gnat would lay up to 300 eggs in her lifetime. Gnat larvae have white and sometimes transparent bodies. Their head will be a speck of black, and they crawl around on their bellies. After they hatch from their yellowish-white eggs, they spend ten days as a larva before preparing themselves for several days in the pupal stage to metamorphosize into fully grown gnats.