White Goldenrod Crab Spider -- Misumena vatia

These spiders can change color.  When they're on a bright yellow flowering goldenrod, they, too, will be bright yellow.  They are sometimes called 'banana spiders' because of their yellow color.  Their small jaws do contain venom, but their bites (which seldom happen) are harmless to humans.  They are helpful in gardens, as they consume many pests, including grasshoppers that are much bigger than the spider.  They do not build webs.