I have a several japanese maple trees in my backyard (Maryland USA). One of them (a green varigated variety) has dozens of these spiders monitoring webs and catching insects. The spider in this image is about 1/2 inch (guessing 12 or 13 mm), maybe a tad smaller. If anyone knows what species this may be, please reply. Of course, comments on the image are always welcomed and encouraged. Thanks for viewing.
Cheers, Bob