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Antheraea polyphemus
Found this "little" guy this morning. He was attached to my rear tire! Bigger than a silver dollar, almost the size of a baseball in diameter. Best I can tell from matching pictures is that she's a Hyalophora euryalus – Cecropia Moth, Hyalophora cecropia. See http://en.wikipedia.org/wiki/Hyalophora_... Not exact but close. Looks like a lot of eggs or larvae on her back end... Sorry for the picture quality - Only had my phone, not either of my cameras...
East Hartland, CT, mostly wooded area in a clearing where my house sits...
Large, almost as large in diameter as a baseball.
Saturniidae, Saturniinae, Saturniini, Anteraea polyphemus. Hyalophora has much stronger colors and markings, which are also different. In my eyes this one is the Polyphemus Moth.
http://bugguide.net/node/view/488395/bgi...
http://bugguide.net/node/view/493623/bgi...
http://bugguide.net/node/view/754592/bgi...
Great first spotting on Noah - welcome to the Project! You could submit this to BugGuide.net to get a confirmation of your ID. I moved this to the arthropods category for you.