Troglodyte has two different bite stats?

I’m pretty new to this GMing thing, and am running a prebuilt Pathfinder module. I am setting up the next encounter for my party and noticed that the Troglodyte entry in the bestiary has two different bite stats and am not sure how to determine which one to use. To better explain what I’m trying to describe:

OFFENSE

Speed 30 ft

Melee club +2 (1d6+1), claw -3 (1d4), bite -3 (1d4) or 2 claws +2 (1d4+1), bite +2(1d4+1)

Basically, how do I determine if I am using the -3(1d4) bite or the +2(1d4+1) bite?