Though I can't say 100%, there is a very good chance that these are Oothecae (egg cases) of Mantis religiosa, European Mantis. I believe they are the only Mantids found in your area. Some info on Mantis religiosa:
http://bugguide.net/node/view/22947
It would be great if you would consider adding this to the Marvelous Mantids of the North East mission:
http://www.projectnoah.org/missions/15738247
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