I came upon an adult Wheel Bug (Arilus cristatus) as I was walking down the boardwalk into the Wetlands (10/26). It too was walking on boardwalk, although on the railing.
Fall is the time of year that I typically encounter these assassin bugs in their adult form. The large insects (they can reach nearly 1.5″) have most likely already mated and deposited eggs on tree limbs, sides of buildings, and maybe on the Museum’s boardwalk. The eggs will hatch next April or May.
The nymphs look quite different from the adults.