Spider Jockey

Spider Jockeys are a type of spiders carrying a Skeleton that shoot arrows at you and spawn Silverfish. They can appear in the Spider's Den.

This mob deals 55.

Spawning
They appears in the center of the Spider's Den, mostly on the higher levels. If you go to the peak of the mountain in the Spider's Den, one will spawn every five seconds or so which makes this a good place to farm spiders and skeletons.