This is a type of wasp.
Possibly Euodynerus megaera or Euodynerus schwarzi :
http://www.biology.ualberta.ca/bsc/ejournal/bmc_05/31e_megaera.html
http://www.biology.ualberta.ca/bsc/ejournal/bmc_05/34e_schwarzi.html
http://bugguide.net/node/view/84841
http://bugguide.net/node/view/150960
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