Whitebanded Crab Spider . (often called flower spiders) are known for their oversized front legs and resemblance to the familiar crustacean seafood item. The term flower spider comes from their habit of lying in wait on flowers, much like the assassin bug or numerous other opportunistic predators. Crab spider is an ambush predator. It will attack and eat just about any creature that comes close enough- even some that are larger than it is. Males are smaller than females, and have much longer legs. They do not use silk to capture prey.