Surge Bugs[1] are a type of ammo originally intended to be used in Stranger's Wrath, but we’re dropped from the final game for unknown reasons.

Several concepts of a surge bug
Appearance[]
Surge Bugs are a small green grub-like insect with a lone Antena upon their large heads. They poses six legs and have small fly-like wings. Due to the name Surge Bug, it could be implied that they use some form of electricity but if that is valid is unknown.