Can you lend a hand identify an insect? I live in Masachusetts and the other daytime when I was...

I live in Masachusetts and the other daytime when I was walking surrounded by a parking lot there be a huge bug that flew by me and landed on my coup¨¦ tire. I had never see anything like it. I enjoy to go on what I remember roughly it but if you can give any suggestions or pattern sites, that would be great. It was roughly 4 inches long with wing and very long antennae, longer than it's body, and it be mostly black. It looked like a big grasshopper or something. Just wondering if any of you might know or own an idea of what it be? Thanks
Answers:    Could have be a dobson fly. They can look pretty intimidating and they are hatching right very soon. Go to www.whatsthatbug.com. cool site!
Were the wings whiteish gray? be the body kinda fury or fuzzy lookin? Spots on the wings? You guys hold Gypsy mothes by you? They are BIG!