Revelation 9:2

And he opened the bottomless pit, and smoke arose out of the pit like the smoke of a great furnace.  So the sun and the air were darkened because of the smoke of the pit.

·         The devil carries on his designs by extinguishing light and knowledge (MH)

·         These are obviously not “natural” locusts. They avoid plants and attack men like scorpions attack. They are “A visual representation of the hordes of demons loosed upon the earth.” (Walvoord)