And they had tails like unto scorpions, and there were stings in their tails: and their power was to hurt men five months. They had tails like unto scorpions - This may refer to the consequences of their victories. They infected the conquered with their pernicious doctrines.
Their power was to hurt men five months - The locusts make their principal ravages during the five summer months. But probably these may be prophetic months, as above, in Revelation 9:5 - 150 years.