Insect -- Assassin Bugs

The assassin bug family includes the wheel bug (Arilus cristatus), a large, imposing insect identified by its neck crest that looks like the blade of a circular saw, and ambush bugs (numerous species in subfamily Phymatinae), which are relatively small, well camouflaged, and used to be placed in their own family.sources

Similar species: Leaf-footed bugs (family Coreidae) are commonly mistaken for assassin bugs. Most leaf-footed bugs have flattened, leaflike extensions on their hind legs. Leaf-footed bugs are plant-eaters. The squash bug is one example.sources