They are common called locusts ( family Acrididae.) Some species are
The insect is the locust.
Locust
From http://www.ecologyasia.com/verts/bats/lesser-bamboo-bat.htm : "The Bamboo Bat...will forage at night for flying insects, particularly termite swarms."
The only predator that stands a chance at catching a swallow or a swift is the falcon.
Many insects travel in swarms - including (but not limited to) bees, flies, grass-hoppers, locusts, moths & butterflies.
Not specifically, but the Old Testament does mention swarms of flies in Exodus 8:20 and does not specify what specific types of flies they were, so it could possibly have meant any kind of flying insects.
Aggregations, colonies and swarms are examples of terms for groups of insects such as bees. Aggregations refer to bees that do not live in colonies, such as hive-dwelling apids. Swarms reference the worker bees that leave an established colony in the spring in company with the old queen.
Most ants have no wings, but during summer, you can see swarms of winged ants flying out looking for a new nest.
around here it is the Northern pine beetle.
Swarms only has one syllable.
swarms of grasshoppers
There are swarms of bugs. Bugs are really insects that have covers over their wings. A ladybug is a true bug. Its orange and speckled wing covers are easily recognizable. Some insects like craneflies hatch out of their eggs nearly all at the same time. Fishermen call these groups of insects, "Hatches".
Harmful insects are insects that are harmful in any way to plants, animals or humans. There are many ways in which insects can be harmful to the above; insects such as locusts can form huge swarms that can destroy whole crops in minutes. Other insects can pierce a leaf or stem of a plant and suck out its juices, leaving the plant to wither and die. Various types of insect carry diseases such as malaria and encephalitis which leave many children in developing countries orphaned and many parents childless.
Termite swarms can be confused with flying ants, but a living olive tree can be infested with termites. They will gnaw away at the branches until the tree eventually dies.