Ephemera

so named from the extreme shortne of their lives in the perfect state. They are known as Mayflies or day-flies. In the state of larve and pup they are aquatic and exist for years. When ready for their final change they creep out of the water, generally toward sunset of a fine summer evening, beginning to be seen generally in May. They shed their whole skin shortly after leaving the water, propagate their species, and die, taking no food in the perfect state. The May-fly is well known to anglers.