Four of these lovely arachnids showed up in webs in our garden. I did not realize that such large and colorful spiders lived in Indiana.


  
I think that this spider is a Yellow/Black Argiope (Argiope aurantia). Here is where I located its presence on the World Wide Web:

Information on Argiope aurantia

A good WWW source for information on spiders is The Arachnology Home Page.