> The Rocky Mountain locust ranged through the western half of the United States and some western portions of Canada. Sightings often placed their swarms in numbers far larger than any other locust species, with one famous sighting in 1875 estimated at 198,000 square miles (510,000 km2) in size (greater than the area of California), weighing 27.5 million tons and consisting of some 12.5 trillion insects.
> Less than 30 years later, the species was apparently extinct. The last recorded sighting of a live specimen was in 1902 in southern Canada.
> North America is currently the only continent besides Antarctica without a native locust species.
 Minute Earth - https://www.youtube.com/watch?v=aQ804ztWPNs
The theory for this 'prime number' periodic cycle is quite interesting: