Pests are flying creatures found throughout Hell. Pests resemble large wasp-like bugs, with a hooked stinger extending from behind. They also have the ability to shoot a burst of flame from their tails. Later in the game, Dante will encounter another variant of Pests, known as Fiends.
Pests don't pose much of a threat as they go down with just a few swings of the Scythe. However, using the cross at a distance is usually the best way to dispatch them, as they often fly outside of Dante's effective range. One grab from the scythe will kill them in one hit.
The Pest may be based on a similar creature found in the original Divine Comedy. In the Vestibule of Hell where the Opportunists are forced to stay, they are described in the canto as chasing a white banner, unable to stop due to wasp-like insects that continually sting them to goad them on. The insects are symbolic of the guilty conscience of these sinners, who ignored morals and ethical behavior in order to service themselves above all else.