Wolf Spiders, Family Lycosidae
As their common name implies, most of the species in this group are hunters that can be seen running over vegetation, rocks, etc. Some in this group build a sheetweb and some dig burrows. The females carry their egg case around with them attached to the spinnerets and when the young hatch, they climb up on the females back and ride around for a while. A very easy way to find these spiders is with a flashlight at night. Go outside and hold the flashlight along side your head at the same level as your eyes. Shine the beam down to the ground and look for little blue sparkles. That eye-shine will probably be from a wolf spider. When you find a female with babies, there are a lot of little blue sparkles!