Tiny White Micrathena (Micrathena mitrata) Spider
This tiny little spider was on the screened porch. Didn't know it was a spider since it was too tiny to see anything about it. While I was positioning it for a photo it spun a web to repel off the tabletop, so at least I knew it then. It's part of the Orb Weaver Family of spiders, being barely 1/4 inch long. It has an irregular, flat shield with black markings on white, at the top of its abdomen, also having two short spines. This spider spins a very dense web, especially when you consider its size. They can often be seen at eye level along woodland trails.