CT
Spiders are not my specialty. But after much searching I will guess it is a jumping spider and more specifically Platycryptus undatus. Here are other photos of it. http://bugguide.net/node/view/3354/bgimage
As with most spiders being able to see the number of eyes and mouthparts are especially important in Id. Neither of which could be seen well here.
Like all spiders they feed on insects. However this family of spiders do 'jump' rather than walk or run to move around.
