The banded argiope spider, Argiope trifascianta, is a large spider that is found through out North America, as well as many other places around the world. As a member of the orb weaver family of spiders, Araneidae, their eye site is not as good so they spin large orb shaped webs in the tall grass.
I took these pictures in September of 2010 at the Minnesota Valley Refuge. I was looking for dragonflies and spotted the bright yellow color in the grass. Due to their bright yellow color they are often called the yellow garden argiope. Usually you do not see these spiders until the fall. Up to 10,000 spider hatch from the egg sack during the summer but they stay hidden until fall when they are large enough to protect themselves and mate.