Wasps are our allies. Paper wasps rescue our trees, crops, and other plant life by eating insects such as caterpillars and cutworms. Fireflies are in a pattern of decline. They are really beetles, not flies, and their larvae are glowworms. Firefly flashing has to do with sex.
Males use flashes to signal females and the interval between flashes identifies the species.
There are about 2000 kinds of fireflies in the world. Another summer night time visitor is the bat. Bats, which can live for 30 years, have a storied past in science and fiction. One bat may eat 200 mosquitos in a single night. Then there are green darners or dragonflies.