Xysticus is a genus of
crab-spiders. Xysticus and Coriarachne are the dark brown or reddish-brown crab spiders often encountered on weeds or trees. While similar to the flower spiders, they tend to have shorter, sturdier legs and more patterned abdomens. They move slowly, and tend to hunt by stationing themselves in a high-traffic area and grabbing whatever
arthropod passes close enough.
See more at Wikipedia.org...