Looks like being the Arrowhead Spider, Verrucosa arenata.
http://www.easttennesseewildflowers.com/gallery/index.php/spiders/Copy_2_of_Spider_Yellow_triangle1
http://4.bp.blogspot.com/-WPNBT3RW7U4/Tj4OXKHZhvI/AAAAAAAAHrg/c_-8hiN79i8/s1600/5+Triangle-bearing+Orbweaver%252C+Verrucosa+arenata%252C+Gallagher+Fen%252C+Clark+Co.%252C+OH+July+31%252C+2011+%25288%2529.JPG
http://bugguide.net/node/view/312052/bgpage
http://bugguide.net/node/view/578099/bgimage
http://bugguide.net/node/view/2035/bgimage
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