We have a mature Honey Locust tree that is starting to drop some leaves which I interpret as a sign of a problem. The leaves that are dropping on our deck are turning yellow and have a single brown spot on them. A bug with long back legs was found on the deck and it's mouth parts seemed to be stuck to one of the dark spots; its body also looked slit open on the back and the innards appeared to be gone (I might be imagining this). The photos should help. Thank you for your assistance.