 They're up for a month. They came up around June 20, of course, the first day of summer, and they stick around until about July 20. The females are brown. They're the culprits. They're the ones that lay hundreds of eggs. In fact, that's the only way that you can tell the male from the female because they're brown. The male are very colorful, but they eat a lot, too, and they eat about 400 species of plants here per year.