ok we are on the illinois iowa border and we call these 1. may flies ( although it's july and we're just getting them) but we mostly call them 2. Mormon flies i'm sorry- i really don't know why except that Nauvoo illinois has a large population of mormans visiting the same time of year that the may flies come. everyone here calles them the mormon flies. even the mormons. funny- i thought we were the only ones plagued with these awful things. They multiply by the thousands and yet only live for about 24 hours and stink like fish. Ewwwww!